Automating a list of aronyms from an existing document

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From: DeRobertis (pete.derobertis_at_lmco.com)
Date: 05/06/04 

Date: Thu, 6 May 2004 16:06:03 -0700

I have a long document with extensive use of acronyms. I am required to generate an acronym list at the end of the document. Is there a way to automate that process (the acronyms will be all caps, obviously, if that helps)? Is there a way to ensure that each acronym is shown only once in the acronym list?

Thanks.