A-keywords are for CHM files only

Associative or A-keywords are only used in Microsoft's HTML Help (CHM) format. They are not available in any other format.

A-keywords are for "fuzzy" calls to your CHM files

A-keywords are quite similar to normal keywords but they not displayed in the index and are not seen by the user. They enable you to make "fuzzy" calls to your CHM help file from your application to display multiple topics associated with the same keyword.

These calls display all the topics in the CHM file that are associated with (i.e. contain) the A-keywords you specify in your call, and alternatively also a fallback topic if none of the A-keywords are found.

Entering A-keywords — multiple topics can have the same A-keywords

You enter A-keywords for topics in the Topic Options tab on the left of the main Help+Manual editor window. Unlike help context numbers, which must be unique in the entire project, multiple topics can have the same A-keyword.

About calls to A-keywords

See About A-keywords for background information and consult the HTML Help CHM API reference in the help of Microsoft HTML Help Workshop for details on the calling syntax. However, how the calls are made in your specific programming language will depend on the implementation in that language. You will need to consult your IDE and language documentation for the specifics.

See also:

About A-keywords (Reference)