fsState (USHORT)

Shift key status flag.

Values are:

Bit 15

SysReq key down
Bit 14
Caps Lock key down
Bit 13
NumLock key down
Bit 12
Scroll Lock key down
Bit 11
Right Alt key down
Bit 10
Right Ctrl key down
Bit 9
Left Alt key down
Bit 8
Left Ctrl key down
Bit 7
Insert on
Bit 6
Caps Lock on
Bit 5
NumLock on.
Bit 4
Scroll Lock on
Bit 3
Either Alt key down
Bit 2
Either Ctrl key down
Bit 1
Left Shift key down
Bit 0
Right Shift key down

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