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I know most about the WInHelp environment, and there are two books about
authoring specifically for that environment:
Developing Online Help for Windows by Boggan, Farkas and Welinske. Available
from WinWriters 206 285 2830
A Developer's guide to WINHELp.EXE by Jim Mischel, John Wiley and Sons,
available in good computer bookstores.
As for a general guide to creating hypertext, you can always start with William
Hortons Writing Online Documention (Willey I am
sure).