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Chet Ensign asked about Masterhelp. It is made by:
575 Southlake Blvd
Richmond VA 23236
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.