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Chet Ensign asked about Masterhelp. It is made by:
Performance Software
575 Southlake Blvd
Richmond VA 23236
(804)794-1012
I've used their Ventura Publisher version, not the SGML version. It
works all right for Ventura files, once you've figured out the interface
(which may take a while, as the docs aren't much help). The company is
very good about support, though.