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About Hot-Key Control Messages
After creating a hot-key control, an application interacts with it by using
three messages: HKM_SETRULES, HKM_SETHOTKEY, and HKM_GETHOTKEY.
An application can send the HKM_SETRULES message to specify a set of CTRL, ALT, and SHIFT key combinations that are considered invalid hot keys. If the application
specifies an invalid key combination, it should also specify a default modifier
combination to use when the user selects the invalid combination. When the user
enters the invalid combination, the system performs a logical-OR operation on
the invalid combination entered by the user and the default combination. The
result is considered a valid combination; it is converted to a string and displayed
in the control.
The HKM_SETHOTKEY message allows an application to set the hot key combination for a hot-key
control. This message is also typically used when the hot-key control is created.
Applications use the HKM_GETHOTKEY message to retrieve the virtual-key code and modifier flags of the hot key
chosen by the user of a hot-key control.
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