To use dlh, invoke dlhwith the filename of your main LaTeXfile as the argument. The command dlh manual.tex would translate manual.tex and all the files it includes.
The output files are placed in a subdirectory of the same name as the mainfile (without the .tex extension). With the above example, the output would be placed in directory manual. In that directory, doc000.html is the html title-page. There is a symlink called index.html that points to that page. When accessing the document via a UNIX http server, this makes it possible to refer to the title page by simply specifying the name of the directory.