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Handles the ID_HELP_INDEX command and provides a default Help topic.

afx_msg void OnHelpIndex( );

You must add an ON_COMMAND( ID_HELP_INDEX, OnHelpIndex ) statement to your CWinApp class message map to enable this member function. If enabled, the framework calls this message-handler function when the user of your application selects the Help Index command to invoke WinHelp with the standard HELP_INDEX topic.

Header: afxwin.h