VDisplayHelp - displays the HELP window.
VDisplayHelp displays the HELP window and displays the various buttons
that are used to list information on different topics. VDisplayHelp also
allows the user to select the topics and displays th information. There is a
list of topics that can be selected. The ASCII text containing the HELP
information is stored in FILES/HELPFILE. The format of HELPFILE is described
in Appendix C.
0 - work successfully.
1 - memory allocation error.
284 - HELP window is currently displayed.
285 - INFO window is currently displayed.
286 - ANNOTATION mode is on.
The contents of the image window may be destroyed. Events will be removed
from the queue.
VCreateColormap should be called earlier,else VDisplayHelp prints an
error message to the standard error stream, produces a core dump file
and exits from the current process.