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### Index

The explicit index is assumed to be redundant in on-line help, since search facilities are provided. Therefore the `\printindex` command does nothing in on-line versions. In linear RTF an index field is added, and `\index` marks words for inserting in the index.

In Windows Help, all section headings and C++ function names are treated as keywords. A keyword may be ambiguous, that is, refer to more than one section in the help file. This automatic indexing may not always be adequate, so the LaTeX `\index` command may be used to add keywords.

In wxHelp, all section headings are indexed.