When installing wxHelp, set the environment variable WXHELPFILES to be the list of directories you wish wxHelp to search when loading a file. wxHelp also searches the directories in the PATH variable.
To invoke wxHelp, start it on the command line with an optional filename, e.g.
% wxhelp -f help.txt
If you specify the -edit switch, wxHelp will start up in Edit mode.
There is also a -server switch for specifying the numeric identifier used by programs connecting to wxHelp (see later).
A contents page should appear, with highlighted blocks of text, some of which are mouseable (click with the left mouse button). Clicking on these takes you to other parts of the help file.
Above the main text area is a panel with buttons for commonly-used operations, and a menu bar.