Setting Button State by Specifying Its Usage
An application or driver can set the state of buttons in a properly-initialized HID report by calling one of the following HID support routines:
- HidP_SetButtons (or HidP_SetUsages)
Sets a specified set of buttons to ON (1).
- HidP_UnsetButtons (or HidP_UnsetUsages)
Sets a specified set of buttons to OFF (zero).
- See also Initializing HID Reports.