About Commands

The HTML Help API supports a set of commands (uCommand values) that enable you to access functionality programmatically.

The most basic of the commands is HH_DISPLAY_TOPIC, which enables you to open a compiled help (.chm) file in a specific help window and display a specific topic within the help file.

Commands quick reference

Category	Commands
Window types	HH_CLOSE_ALL HH_GET_WIN_HANDLE HH_GET_WIN_TYPE HH_SET_WIN_TYPE
Context-sensitive help	HH_DISPLAY_TEXT_POPUP HH_DISPLAY_TOPIC HH_HELP_CONTEXT HH_TP_HELP_CONTEXTMENU HH_TP_HELP_WM_HELP
Keyword lookups	HH_ALINK_LOOKUP HH_KEYWORD_LOOKUP
Navigation pane	HH_DISPLAY_INDEX HH_DISPLAY_SEARCH HH_DISPLAY_TOC
Error messages	HH_GET_LAST_ERROR
Contents synchronization	HH_SYNC
Single threading	HH_INITIALIZE HH_PRETRANSLATEMESSAGE HH_UNINITIALIZE

	About the HTML Help API

About Commands

Commands quick reference

Window types

Context-sensitive help

Keyword lookups

Navigation pane

Error messages

Contents synchronization

Single threading