Displays the XBoard documentation in info format. For this feature to
work, you must have the GNU info program installed on your system, and
the file xboard.info must either be present in the current
working directory, or have been installed by the ‘make install’
command when you built XBoard.
Man XBoard
Displays the XBoard documentation in man page format.
The F1 key is a keyboard equivalent. For this
feature to work, the file xboard.6 must have been installed by
the ‘make install’ command when you built XBoard, and the
directory it was placed in must be on the search path for your
system's ‘man’ command.