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name            hopen  --  opens help file and index

synopsis        c = hopen(msgfil,ndxfil);
                COUNT c;          if no error 0 else -1,-2,-3
                TEXT msgfil[32];  help file
                TEXT ndxfil[32];  index to help file

description  opens the help file and the index file and calls
           hload to load index.
           returns: 0 if everything ok
                   -1 if help file cannot be opened
                   -2 if index file cannot be opened
                   -3 if index file cannot be closed