Format: SET HELP [file-specification]

 The SET HELP (abbreviated SE H) option lets you define which help file
 will be accessed when you either give the HELP command or press the HELP
 key in keypad mode.  The default device and directory are always as
 listed below unless overriden by an explicit device and directory.  SET
 HELP without a file specification returns you to the original default
 help file.

 The following are default specifications for the various systems:

                    File specification  Name      Type
                    ------------------  ----      ----
 VAX/VMS            SYS$HELP: .HLB      EDTHELP   .HLB
 RSX-11M & M-PLUS   LB:[1,2] .HLP       EDTHELP   .HLP
 RSTS/E             LB: .HLP            EDTHEL    .HLP