Path: utzoo!attcan!uunet!lll-winken!lll-lcc!ames!pasteur!ucbvax!VPFVM.BITNET!XRBEO
From: XRBEO@VPFVM.BITNET (Bruce O'Neel)
Newsgroups: comp.os.vms
Subject: Re: Menu system like help
Message-ID: <8807161623.AA00647@ucbvax.Berkeley.EDU>
Date: 12 Jul 88 12:44:03 GMT
References: 
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 2

If  understand you correctly, you can get away with a

 $ xyz :== "HELP/LIBRARY=XYZ" do do what you want