Indexing a Software Manual
http://www.stc.org/ConfProceed/1993/PDFs/Pg6063.pdf

Tetreault, Edouard
STC Proceedings
1993

Abstract:

Indexing a software manual is not very different from indexing any other manual. As a simple rule, make sure you index all of the software features: screens, windows, fields, options and commands. Index system errors and warnings if applicable. Use cross-references to direct the reader to the term used in the manual if it differs from the generally-used jargon.