A bit mask that defines the specific event messages permitted to be written
into the caller's event queue. The following bits are defined for the EventMask
field:
Bit #
3
4
5
6
7
8
9
Critical Resume Event All
other bits are reserved and must be 0.
If any of the reserved bits
in the EventMask field are set (value = 1), the request fails with
a ReturnCode value of PowerBadReserved.