





                        LINGER 1.1
           (Information on PROLOG-2 Version 1.1)

                        Paul O'Brien
                 Department Of Computer Science,
                     Exeter University,
                      Exeter, EX4 4PT.
                  (paul@uk.ac.exeter.cs)

Basic Requirements

     The PROLOG-2 version of Linger  can  be  used  on  most
IBM/clones  above 512 k.  Inorder to run Linger it is neces-
sary   to  have   Expert  Systems  International's  PROLOG-2
installed onto your micro. LINGER could be adapted to run on
any other prolog with standard Edinburgh syntax.



Files

     The system includes a number of files these  have  been
added  to  enable  the  system  to  work  in  PROLOG-2.  The
language files are frenchd.pro (dictionary) and  frenchg.pro
(grammar).   The  bug catalogue is in the grammar file.  The
shell is housed in the file shell.pro, which when read  into
PROLOG-2  calls  the  other  necessary  files for it to run,
(interpre.pro, debug.pro, name.pro).  Debug.pro  has  a  few
useful debugging aids, as does  shell.pro. The shell is par-
tially commented which might be of some use.

To Run Linger

     Once you are in PROLOG-2 , read in  the  shell  by  the
command :

        ?- [shell].

This will read in both the shell and  its  necessary  files.
By typing the command :

        ?- run.

You will start Linger.

There are two exit points , at the prompts :


        ?- Another go -->

               and

        ?- Enter Sentence -->


You can enter any of the following - stop, n, no, f, finish,
end,  e,  halt,  out,  q, quit - to finish the session.  Two
technical reports describe Linger in more  detail and  these
are in the files Paper1 and Paper2 on the accompanying disk.









                           - 2 -


Linger  - Development and Use

     Linger is in no way complete , the system you have is a
prototype  which   at  present  is   being reimplemented and
redesigned at Exeter University. It is  relatively  easy  to
add  another  language  which the shell could use, at Exeter
Italian, Spanish, and German  databases  have  already  been
written  for  the CProlog version 1.0.  For more information
on Linger 2 (tutoring strategies) and Linger 3  (explanation
capabilities)  contact  Jo  Uren and Judith Wusteman respec-
tively.  All Linger (bug finder) enquiries to Paul  O'Brien.
     These  projects  are  directed  by  Masoud Yazdani  and
funded by ESRC, SERC, and the MSC.
