

          The help facility allows for display of help files extracted
          from the standard Tcl manual pages and Tcl scripts.  Help
          files are structured in a multilevel directory tree of
          subjects and help files.  The following commands and options
          are provided with the help package:

          help
               Help, without arguments, lists of all the top-level
               help subject directories and files.

          help subjectdir
               Displays all of help files and lower level subject
               files (if any exist) under the directory subjectdir.

          help subjectdir/helpfile
               Display the specified help file.  The help output is
               passed through a simple pager if output exceeds 23
               lines, pausing waiting for a return to be entered.  If
               any other character is entered, the output is
               terminated.

          helpcd [subjectdir]
               Change the current subject directory, which is much
               like the Unix current directory.  This directory can be
               changed with the helpcd command.  If subjectdir is not
               specified, return to the top-level of the help tree.
               Help path names may also include ``..'' elements.

          helppwd
               Displays the current help subject directory.

          help help | ?
               Displays help on the help facility at any directory
               level.

          apropos pattern
               This command locates subjects by searching their one-
               line descriptions for a pattern.  Apropos is useful
               when you can remember part of the name or description
               of a command, and want to search through the one-line
               summaries for matching lines.  Full regular expressions
               may be specified (see the regexp command).
