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     An abbrev is a text string which expands into a different text
     string when present in the buffer.  For example, you might define
     a short word as an abbrev for a long phrase that you want to insert
     frequently.  Note: Abbrevs.

     Aborting means getting out of a recursive edit (q.v.).  The
     commands `C-]' and `M-x top-level' are used for this.  *Note

     Alt is the name of a modifier bit which a keyboard input character
     may have.  To make a character Alt, type it while holding down the
     ALT key.  Such characters are given names that start with `Alt-'
     (usually written `A-' for short).  Note: Alt.

Auto Fill Mode
     Auto Fill mode is a minor mode in which text that you insert is
     automatically broken into lines of fixed width.  Note: Filling.

Auto Saving
     Auto saving is the practice of saving the contents of an Emacs
     buffer in a specially-named file, so that the information will not
     be lost if the buffer is lost due to a system error or user error.
     Note: Auto Save.

Backup File
     A backup file records the contents that a file had before the
     current editing session.  Emacs makes backup files automatically
     to help you track down or cancel changes you later regret making.
     Note: Backup.

Balance Parentheses
     Emacs can balance parentheses manually or automatically.  Manual
     balancing is done by the commands to move over balanced expressions
     (Note: Lists.).  Automatic balancing is done by blinking the
     parenthesis that matches one just inserted (*note Matching Parens:

     To bind a key sequence means to give it a binding (q.v.).  *Note

     A key sequence gets its meaning in Emacs by having a binding,
     which is a command (q.v.), a Lisp function that is run when the
     user types that sequence.  Note: Binding.  Customization
     often involves rebinding a character to a different command
     function.  The bindings of all key sequences are recorded in the
     keymaps (q.v.).  Note: Keymaps.

Blank Lines
     Blank lines are lines that contain only whitespace.  Emacs has
     several commands for operating on the blank lines in the buffer.

     The buffer is the basic editing unit; one buffer corresponds to one
     piece of text being edited.  You can have several buffers, but at
     any time you are editing only one, the `selected' buffer, though
     several can be visible when you are using multiple windows.  *Note

Buffer Selection History
     Emacs keeps a buffer selection history which records how recently
     each Emacs buffer has been selected.  This is used for choosing a
     buffer to select.  Note: Buffers.

Button Down Event
     A button down event is the kind of input event generated right
     away when you press a mouse button.  Note: Mouse Buttons.

     `C' in the name of a character is an abbreviation for Control.
     Note: C-.

     `C-M-' in the name of a character is an abbreviation for
     Control-Meta.  Note: C-M-.

Case Conversion
     Case conversion means changing text from upper case to lower case
     or vice versa.  Note: Case, for the commands for case conversion.

     Characters form the contents of an Emacs buffer; see Note: Text
     Characters.  Also, key sequences (q.v.) are usually made up of
     characters (though they may include other input events as well).
     Note: User Input.

Click Event
     A click event is the kind of input event generated when you press a
     mouse button and let it go without moving the mouse.  Note: Mouse

     A command is a Lisp function specially defined to be able to serve
     as a key binding in Emacs.  When you type a key sequence (q.v.),
     its binding (q.v.) is looked up in the relevant keymaps (q.v.) to
     find the command to run.  Note: Commands.

Command Name
     A command name is the name of a Lisp symbol which is a command
     (Note: Commands.).  You can invoke any command by its name using
     `M-x' (Note: M-x.).

     A comment is text in a program which is intended only for humans
     reading the program, and which is marked specially so that it will
     be ignored when the program is loaded or compiled.  Emacs offers
     special commands for creating, aligning and killing comments.
     Note: Comments.

     Compilation is the process of creating an executable program from
     source code.  Emacs has commands for compiling files of Emacs Lisp
     code (Note: Byte Compilation.) and
     programs in C and other languages (Note: Compilation.).

Complete Key
     A complete key is a key sequence which fully specifies one action
     to be performed by Emacs.  For example, `X' and `C-f' and `C-x m'
     are complete keys.  Complete keys derive their meanings from being
     bound (q.v.) to commands (q.v.).  Thus, `X' is conventionally
     bound to a command to insert `X' in the buffer; `C-x m' is
     conventionally bound to a command to begin composing a mail
     message.  Note: Keys.

     Completion is what Emacs does when it automatically fills out an
     abbreviation for a name into the entire name.  Completion is done
     for minibuffer (q.v.) arguments when the set of possible valid
     inputs is known; for example, on command names, buffer names, and
     file names.  Completion occurs when TAB, SPC or RET is typed.
     Note: Completion.

Continuation Line
     When a line of text is longer than the width of the window, it
     takes up more than one screen line when displayed.  We say that the
     text line is continued, and all screen lines used for it after the
     first are called continuation lines.  Note: Continuation.

Control Character
     ASCII characters with octal codes 0 through 037, and also code
     0177, do not have graphic images assigned to them.  These are the
     Control characters.  To type a Control character, hold down the
     CTRL key and type the corresponding non-Control character.  RET,
     TAB, ESC, LFD and DEL are all control characters.  Note: User

     When you are using the X Window System, every non-control
     character has a corresponding control character variant.

     A copyleft is a notice giving the public legal permission to
     redistribute a program or other work of art.  Copylefts are used by
     left-wing programmers to give people equal rights, just as
     copyrights are used by right-wing programmers to gain power over
     other people.

Current Buffer
     The current buffer in Emacs is the Emacs buffer on which most
     editing commands operate.  You can select any Emacs buffer as the
     current one.  Note: Buffers.

Current Line
     The line point is on (Note: Point.).

Current Paragraph
     The paragraph that point is in.  If point is between paragraphs,
     the current paragraph is the one that follows point.  *Note

Current Defun
     The defun (q.v.) that point is in.  If point is between defuns, the
     current defun is the one that follows point.  Note: Defuns.

     The cursor is the rectangle on the screen which indicates the
     position called point (q.v.) at which insertion and deletion takes
     place.  The cursor is on or under the character that follows
     point.  Often people speak of `the cursor' when, strictly
     speaking, they mean `point'.  Note: Cursor.

     Customization is making minor changes in the way Emacs works.  It
     is often done by setting variables (Note: Variables.) or by
     rebinding key sequences (Note: Keymaps.).

Default Argument
     The default for an argument is the value that will be assumed if
     you do not specify one.  When the minibuffer is used to read an
     argument, the default argument is used if you just type RET.
     Note: Minibuffer.

Default Directory
     When you specify a file name that does not start with `/' or `~',
     it is interpreted relative to the current buffer's default
     directory.  Note: Default Directory.

     A defun is a list at the top level of parenthesis or bracket
     structure in a program.  It is so named because most such lists in
     Lisp programs are calls to the Lisp function `defun'.  *Note

     DEL is a character that runs the command to delete one character of
     text.  Note: DEL.

     Deletion means erasing text without copying it into the kill ring
     (q.v.).  The alternative is killing (q.v.).  *Note Deletion:

Deletion of Files
     Deleting a file means erasing it from the file system.  Note: Misc
     File Ops.

Deletion of Messages
     Deleting a message means flagging it to be eliminated from your
     mail file.  Until you expunge (q.v.) the mail file, you can still
     undelete the messages you have deleted.  Note: Rmail Deletion.

Deletion of Windows
     Deleting a window means eliminating it from the screen.  Other
     windows expand to use up the space.  The deleted window can never
     come back, but no actual text is thereby lost.  Note: Windows.

     File directories are named collections in the file system, within
     which you can place individual files or subdirectories.  *Note
     Directories: ListDir.

     Dired is the Emacs facility that displays the contents of a file
     directory and allows you to "edit the directory", performing
     operations on the files in the directory.  Note: Dired.

Disabled Command
     A disabled command is one that you may not run without special
     confirmation.  The usual reason for disabling a command is that it
     is confusing for beginning users.  Note: Disabling.

Down Event
     Short for `button down event'.

Drag Event
     A drag event is the kind of input event generated when you press a
     mouse button, move the mouse, and then release the button.  *Note
     Mouse Buttons::.

Dribble File
     A file into which Emacs writes all the characters that the user
     types on the keyboard.  Dribble files are used to make a record for
     debugging Emacs bugs.  Emacs does not make a dribble file unless
     you tell it to.  Note: Bugs.

Echo Area
     The echo area is the bottom line of the screen, used for echoing
     the arguments to commands, for asking questions, and printing brief
     messages (including error messages).  Note: Echo Area.

     Echoing is acknowledging the receipt of commands by displaying
     them (in the echo area).  Emacs never echoes single-character key
     sequences; longer key sequences echo only if you pause while
     typing them.

     An error occurs when an Emacs command cannot execute in the current
     circumstances.  When an error occurs, execution of the command
     stops (unless the command has been programmed to do otherwise) and
     Emacs reports the error by printing an error message (q.v.).
     Type-ahead is discarded.  Then Emacs is ready to read another
     editing command.

Error Messages
     Error messages are single lines of output printed by Emacs when the
     user asks for something impossible to do (such as, killing text
     forward when point is at the end of the buffer).  They appear in
     the echo area, accompanied by a beep.

     ESC is a character used as a prefix for typing Meta characters on
     keyboards lacking a META key.  Unlike the META key (which, like
     the SHIFT key, is held down while another character is typed), the
     ESC key is pressed once and applies to the next character typed.

     Expunging a mail file or Dired buffer means really discarding the
     messages or files you have previously flagged for deletion.

Fill Prefix
     The fill prefix is a string that should be expected at the
     beginning of each line when filling is done.  It is not regarded
     as part of the text to be filled.  Note: Filling.

     Filling text means moving text from line to line so that all the
     lines are approximately the same length.  Note: Filling.

     A frame is a rectangular cluster of Emacs windows.  When using X
     Windows, you can create more than one Emacs frame, each having its
     own X window, and then you can subdivide each frame into Emacs
     windows as you wish.  Note: Frames.

Function Key
     A function key is a key on the keyboard that does not correspond
     to any character.  Note: Function Keys.

     Global means `independent of the current environment; in effect
     throughout Emacs'.  It is the opposite of local (q.v.).  Particular
     examples of the use of `global' appear below.

Global Abbrev
     A global definition of an abbrev (q.v.) is effective in all major
     modes that do not have local (q.v.) definitions for the same
     abbrev.  Note: Abbrevs.

Global Keymap
     The global keymap (q.v.) contains key bindings that are in effect
     except when overridden by local key bindings in a major mode's
     local keymap (q.v.).  Note: Keymaps.

Global Substitution
     Global substitution means replacing each occurrence of one string
     by another string through a large amount of text.  Note: Replace.

Global Variable
     The global value of a variable (q.v.) takes effect in all buffers
     that do not have their own local (q.v.) values for the variable.
     Note: Variables.

Graphic Character
     Graphic characters are those assigned pictorial images rather than
     just names.  All the non-Meta (q.v.) characters except for the
     Control (q.v.) characters are graphic characters.  These include
     letters, digits, punctuation, and spaces; they do not include RET
     or ESC.  In Emacs, typing a graphic character inserts that
     character (in ordinary editing modes).  Note: Basic Editing.

     Hardcopy means printed output.  Emacs has commands for making
     printed listings of text in Emacs buffers.  Note: Hardcopy.

     You can type HELP at any time to ask what options you have, or to
     ask what any command does.  The character HELP is really `C-h'.
     Note: Help.

     Hyper is the name of a modifier bit which a keyboard input
     character may have.  To make a character Hyper, type it while
     holding down the HYPER key.  Such characters are given names that
     start with `Hyper-' (usually written `H-' for short).  *Note
     Hyper: User Input.

     An inbox is a file in which mail is delivered by the operating
     system.  Rmail transfers mail from inboxes to mail files (q.v.) in
     which the mail is then stored permanently or until explicitly
     deleted.  Note: Rmail Inbox.

     Indentation means blank space at the beginning of a line.  Most
     programming languages have conventions for using indentation to
     illuminate the structure of the program, and Emacs has special
     commands to adjust indentation.  Note: Indentation.

     Insertion means copying text into the buffer, either from the
     keyboard or from some other place in Emacs.

     Justification means adding extra spaces to lines of text to make
     them come exactly to a specified width.  *Note Justification:

Keyboard Macros
     Keyboard macros are a way of defining new Emacs commands from
     sequences of existing ones, with no need to write a Lisp program.
     Note: Keyboard Macros.

Key Sequence
     A key sequence (key, for short) is a sequence of characters that,
     when input to Emacs, is meaningful as a single unit.  If the key
     sequence is enough to specify one action, it is a complete key
     (q.v.); if it is not enough, it is a prefix key (q.v.).  *Note

     The keymap is the data structure that records the bindings (q.v.)
     of key sequences to the commands that they run.  For example, the
     global keymap binds the character `C-n' to the command function
     `next-line'.  Note: Keymaps.

Keyboard Translation Table
     The keyboard translation table is an array that translates the
     character codes that come from the terminal into the character
     codes that make up key sequences.  Note: Keyboard Translations.

Kill Ring
     The kill ring is where all text you have killed recently is saved.
     You can reinsert any of the killed text still in the ring; this is
     called yanking (q.v.).  Note: Yanking.

     Killing means erasing text and saving it on the kill ring so it
     can be yanked (q.v.) later.  Some other systems call this
     "cutting".  Most Emacs commands to erase text do killing, as
     opposed to deletion (q.v.).  Note: Killing.

Killing Jobs
     Killing a job (such as, an invocation of Emacs) means making it
     cease to exist.  Any data within it, if not saved in a file, is
     lost.  Note: Exiting.

     A list is, approximately, a text string beginning with an open
     parenthesis and ending with the matching close parenthesis.  In C
     mode and other non-Lisp modes, groupings surrounded by other kinds
     of matched delimiters appropriate to the language, such as braces,
     are also considered lists.  Emacs has special commands for many
     operations on lists.  Note: Lists.

     Local means `in effect only in a particular context'; the relevant
     kind of context is a particular function execution, a particular
     buffer, or a particular major mode.  It is the opposite of `global'
     (q.v.).  Specific uses of `local' in Emacs terminology appear

Local Abbrev
     A local abbrev definition is effective only if a particular major
     mode is selected.  In that major mode, it overrides any global
     definition for the same abbrev.  Note: Abbrevs.

Local Keymap
     A local keymap is used in a particular major mode; the key bindings
     (q.v.) in the current local keymap override global bindings of the
     same key sequences.  Note: Keymaps.

Local Variable
     A local value of a variable (q.v.) applies to only one buffer.
     Note: Locals.

     `M-' in the name of a character is an abbreviation for META, one
     of the modifier keys that can accompany any character.  Note: User

     `M-C-' in the name of a character is an abbreviation for
     Control-Meta; it means the same thing as `C-M-'.  If your terminal
     lacks a real META key, you type a Control-Meta character by typing
     ESC and then typing the corresponding Control character.  *Note
     C-M-: User Input.

     `M-x' is the key sequence which is used to call an Emacs command by
     name.  This is how you run commands that are not bound to key
     sequences.  Note: M-x.

     Mail means messages sent from one user to another through the
     computer system, to be read at the recipient's convenience.  Emacs
     has commands for composing and sending mail, and for reading and
     editing the mail you have received.  Note: Sending Mail.  *Note
     Rmail::, for how to read mail.

Mail File
     A mail file is a file which is edited using Rmail and in which
     Rmail stores mail.  Note: Rmail.

Major Mode
     The Emacs major modes are a mutually exclusive set of options,
     each of which configures Emacs for editing a certain sort of text.
     Ideally, each programming language has its own major mode.  *Note
     Major Modes::.

     The mark points to a position in the text.  It specifies one end
     of the region (q.v.), point being the other end.  Many commands
     operate on all the text from point to the mark.  Each buffer has
     its own mark.  Note: Mark.

Mark Ring
     The mark ring is used to hold several recent previous locations of
     the mark, just in case you want to move back to them.  Each buffer
     has its own mark ring.  Note: Mark Ring.

     See `mail'.

     Meta is the name of a modifier bit which a command character may
     have.  It is present in a character if the character is typed with
     the META key held down.  Such characters are given names that start
     with `Meta-' (usually written `M-' for short).  For example, `M-<'
     is typed by holding down META and at the same time typing `<'
     (which itself is done, on most terminals, by holding down SHIFT
     and typing `,').  Note: Meta.

Meta Character
     A Meta character is one whose character code includes the Meta bit.

     The minibuffer is the window that appears when necessary inside the
     echo area (q.v.), used for reading arguments to commands.  *Note

Minibuffer History
     The minibuffer history records the text you have specified in the
     past for minibuffer arguments, so you can conveniently use the
     same text again.  Note: Minibuffer History.

Minor Mode
     A minor mode is an optional feature of Emacs which can be switched
     on or off independently of all other features.  Each minor mode
     has a command to turn it on or off.  Note: Minor Modes.

Minor Mode Keymap
     A keymap that belongs to a minor mode and is active when that mode
     is enabled.  Minor mode keymaps take precedence over the buffer's
     local keymap, just as the local keymap takes precedence over the
     global keymap.  Note: Keymaps.

Mode Line
     The mode line is the line at the bottom of each window (q.v.),
     giving status information on the buffer displayed in that window.
     Note: Mode Line.

Modified Buffer
     A buffer (q.v.) is modified if its text has been changed since the
     last time the buffer was saved (or since when it was created, if it
     has never been saved).  Note: Saving.

Moving Text
     Moving text means erasing it from one place and inserting it in
     another.  The usual way to move text by killing (q.v.) and then
     yanking (q.v.).  Note: Killing.

Named Mark
     A named mark is a register (q.v.) in its role of recording a
     location in text so that you can move point to that location.
     Note: Registers.

     Narrowing means creating a restriction (q.v.) that limits editing
     in the current buffer to only a part of the text in the buffer.
     Text outside that part is inaccessible to the user until the
     boundaries are widened again, but it is still there, and saving
     the file saves it all.  Note: Narrowing.

     LFD characters in the buffer terminate lines of text and are
     called newlines.  Note: Newline.

Numeric Argument
     A numeric argument is a number, specified before a command, to
     change the effect of the command.  Often the numeric argument
     serves as a repeat count.  Note: Arguments.

     An option is a variable (q.v.) that exists so that you can
     customize Emacs by giving it a new value.  Note: Variables.

Overwrite Mode
     Overwrite mode is a minor mode.  When it is enabled, ordinary text
     characters replace the existing text after point rather than
     pushing it to the right.  Note: Minor Modes.

     A page is a unit of text, delimited by formfeed characters (ASCII
     control-L, code 014) coming at the beginning of a line.  Some Emacs
     commands are provided for moving over and operating on pages.
     Note: Pages.

     Paragraphs are the medium-size unit of English text.  There are
     special Emacs commands for moving over and operating on paragraphs.
     Note: Paragraphs.

     We say that certain Emacs commands parse words or expressions in
     the text being edited.  Really, all they know how to do is find
     the other end of a word or expression.  Note: Syntax.

     Point is the place in the buffer at which insertion and deletion
     occur.  Point is considered to be between two characters, not at
     one character.  The terminal's cursor (q.v.) indicates the
     location of point.  Note: Point.

Prefix Argument
     See `numeric argument'.

Prefix Key
     A prefix key is a key sequence (q.v.) whose sole function is to
     introduce a set of longer key sequences.  `C-x' is an example of
     prefix key; any two-character sequence starting with `C-x' is
     therefore a legitimate key sequence.  Note: Keys.

Primary Mail File
     Your primary mail file is the file named `RMAIL' in your home
     directory, where all mail that you receive is stored by Rmail
     unless you make arrangements to do otherwise.  Note: Rmail.

     A prompt is text printed to ask the user for input.  Printing a
     prompt is called prompting.  Emacs prompts always appear in the
     echo area (q.v.).  One kind of prompting happens when the
     minibuffer is used to read an argument (Note: Minibuffer.); the
     echoing which happens when you pause in the middle of typing a
     multicharacter key sequence is also a kind of prompting (*note
     Echo Area::.).

     Quitting means cancelling a partially typed command or a running
     command, using `C-g'.  Note: Quitting.

     Quoting means depriving a character of its usual special
     significance.  In Emacs this is usually done with `C-q'.  What
     constitutes special significance depends on the context and on
     convention.  For example, an "ordinary" character as an Emacs
     command inserts itself; so in this context, a special character is
     any character that does not normally insert itself (such as DEL,
     for example), and quoting it makes it insert itself as if it were
     not special.  Not all contexts allow quoting.  *Note Quoting:

Read-Only Buffer
     A read-only buffer is one whose text you are not allowed to change.
     Normally Emacs makes buffers read-only when they contain text which
     has a special significance to Emacs; for example, Dired buffers.
     Visiting a file that is write protected also makes a read-only
     buffer.  Note: Buffers.

Recursive Editing Level
     A recursive editing level is a state in which part of the
     execution of a command involves asking the user to edit some text.
     This text may or may not be the same as the text to which the
     command was applied.  The mode line indicates recursive editing
     levels with square brackets (`[' and `]').  Note: Recursive Edit.

     Redisplay is the process of correcting the image on the screen to
     correspond to changes that have been made in the text being edited.
     Note: Redisplay.

     See `regular expression'.

     The region is the text between point (q.v.) and the mark (q.v.).
     Many commands operate on the text of the region.  *Note Region:

     Registers are named slots in which text or buffer positions or
     rectangles can be saved for later use.  Note: Registers.

Regular Expression
     A regular expression is a pattern that can match various text
     strings; for example, `l[0-9]+' matches `l' followed by one or more
     digits.  Note: Regexps.

Repeat Count
     See `numeric argument'.

     See `global substitution'.

     A buffer's restriction is the amount of text, at the beginning or
     the end of the buffer, that is temporarily inaccessible.  Giving a
     buffer a nonzero amount of restriction is called narrowing (q.v.).
     Note: Narrowing.

     RET is a character than in Emacs runs the command to insert a
     newline into the text.  It is also used to terminate most arguments
     read in the minibuffer (q.v.).  Note: Return.

     Saving a buffer means copying its text into the file that was
     visited (q.v.) in that buffer.  This is the way text in files
     actually gets changed by your Emacs editing.  Note: Saving.

     Scrolling means shifting the text in the Emacs window so as to see
     a different part of the buffer.  Note: Scrolling.

     Searching means moving point to the next occurrence of a specified
     string.  Note: Search.

     Selecting a buffer means making it the current (q.v.) buffer.
     Note: Selecting.

     Self-documentation is the feature of Emacs which can tell you what
     any command does, or give you a list of all commands related to a
     topic you specify.  You ask for self-documentation with the help
     character, `C-h'.  Note: Help.

     Emacs has commands for moving by or killing by sentences.  *Note

     A sexp (short for `s-expression') is the basic syntactic unit of
     Lisp in its textual form: either a list, or Lisp atom.  Many Emacs
     commands operate on sexps.  The term `sexp' is generalized to
     languages other than Lisp, to mean a syntactically recognizable
     expression.  Note: Sexps.

Simultaneous Editing
     Simultaneous editing means two users modifying the same file at
     once.  Simultaneous editing if not detected can cause one user to
     lose his work.  Emacs detects all cases of simultaneous editing
     and warns the user to investigate them.  Note: Simultaneous

     A string is a kind of Lisp data object which contains a sequence of
     characters.  Many Emacs variables are intended to have strings as
     values.  The Lisp syntax for a string consists of the characters in
     the string with a `"' before and another `"' after.  A `"' that is
     part of the string must be written as `\"' and a `\' that is part
     of the string must be written as `\\'.  All other characters,
     including newline, can be included just by writing them inside the
     string; however, escape sequences as in C, such as `\n' for
     newline or `\241' using an octal character code, are allowed as

String Substitution
     See `global substitution'.

Syntax Table
     The syntax table tells Emacs which characters are part of a word,
     which characters balance each other like parentheses, etc.  *Note

     Super is the name of a modifier bit which a keyboard input
     character may have.  To make a character Super, type it while
     holding down the SUPER key.  Such characters are given names that
     start with `Super-' (usually written `s-' for short).  *Note
     Super: User Input.

Tag Table
     A tag table is a file that serves as an index to the function
     definitions in one or more other files.  Note: Tags.

Termscript File
     A termscript file contains a record of all characters sent by
     Emacs to the terminal.  It is used for tracking down bugs in Emacs
     redisplay.  Emacs does not make a termscript file unless you tell
     it to.  Note: Bugs.

     Two meanings (Note: Text.):

        * Data consisting of a sequence of characters, as opposed to
          binary numbers, images, graphics commands, executable
          programs, and the like.  The contents of an Emacs buffer are
          always text in this sense.

        * Data consisting of written human language, as opposed to
          programs, or following the stylistic conventions of human

Top Level
     Top level is the normal state of Emacs, in which you are editing
     the text of the file you have visited.  You are at top level
     whenever you are not in a recursive editing level (q.v.) or the
     minibuffer (q.v.), and not in the middle of a command.  You can
     get back to top level by aborting (q.v.) and quitting (q.v.).
     Note: Quitting.

     Transposing two units of text means putting each one into the place
     formerly occupied by the other.  There are Emacs commands to
     transpose two adjacent characters, words, sexps (q.v.) or lines
     (Note: Transpose.).

     Truncating text lines in the display means leaving out any text on
     a line that does not fit within the right margin of the window
     displaying it.  See also `continuation line'.  *Note Truncation:

     Undoing means making your previous editing go in reverse, bringing
     back the text that existed earlier in the editing session.  *Note

     A variable is an object in Lisp that can store an arbitrary value.
     Emacs uses some variables for internal purposes, and has others
     (known as `options' (q.v.)) just so that you can set their values
     to control the behavior of Emacs.  The variables used in Emacs
     that you are likely to be interested in are listed in the
     Variables Index in this manual.  Note: Variables, for
     information on variables.

Version Control
     Version control systems keep track of multiple versions of a
     source file.  They provide a more powerful alternative to keeping
     backup files (q.v.).  Note: Version Control.

     Visiting a file means loading its contents into a buffer (q.v.)
     where they can be edited.  Note: Visiting.

     Whitespace is any run of consecutive formatting characters (space,
     tab, newline, and backspace).

     Widening is removing any restriction (q.v.) on the current buffer;
     it is the opposite of narrowing (q.v.).  Note: Narrowing.

     Emacs divides a frame (q.v.) into one or more windows, each of
     which can display the contents of one buffer (q.v.) at any time.
     Note: Screen, for basic information on how Emacs uses the screen.
     Note: Windows, for commands to control the use of windows.

Word Abbrev
     Synonymous with `abbrev'.

Word Search
     Word search is searching for a sequence of words, considering the
     punctuation between them as insignificant.  Note: Word Search.

     Yanking means reinserting text previously killed.  It can be used
     to undo a mistaken kill, or for copying or moving text.  Some other
     systems call this "pasting".  Note: Yanking.

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