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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
Context-sensitive help
Keyword lookups
Navigation pane
Error messages
Contents synchronization
  • [HH_SYNC](
Single threading


About the HTML Help API