FUNCTION  SetHelpFile(filename)              Set default help file name

     The SetHelpFile() function will allow you to use a different
filename to store your help text information.  The default file name
is HELPSYS.  You can use your own naming convention (upto seven (7)
characters are allowed).  The needed indexes will automatically follow
this same naming convention.  This also allows for multiple help files
to be used if the need should arise.

RETURNS   Current help file being used.