hwndDeskTop (HWND) - input

Desktop-window handle.

HWND_DESKTOP

The desktop-window handle
Other
Specified desktop-window handle.

vkey (LONG) - input

Virtual key value.

Contains the virtual key value in the low-order byte, and zero in the high-order byte. See remarks for possible values.

lKeyState (LONG) - returns

Key state.

This value is the OR combination of the following bits:

0x0001

The key has been pressed an odd number of times since the system has been started.
0x8000
The key is down.

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