The help facility allows one to look up help pages which where
extracted from the standard Tcl manual pages and Tcl scripts during
Tcl installation. Help files are structured as a multilevel tree of
subjects and help pages. Help files are found by searching
directories named help in the directories listed in
the auto_path variable. All of the files in the list
of help directories form a virtual root of the help tree. This method
allows multiple applications to provide help trees without having the
files reside in the same directory.
See the manual pages for the following commands: