This message is sent to the current active application window by the Help Manager to notify the application when the user selects a tailored action bar item. 

param1
    USHORT  idCommand   /*  Identity of the action bar item that was selected. */

param2
    ULONG   ulReserved  /*  Reserved value, should be 0. */

returns
    ULONG   ulReserved  /*  Reserved value, should be 0. */

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