hwndDeskTop (HWND) - input

Desktop handle of the screen containing the window to be locked.

HWND_DESKTOP

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

hwndLockUpdate (HWND) - input

Handle of window in which output is to be prevented.

NULLHANDLE

Enable output in the locked window and its descendants.
Other
Handle of the window in which output is to be prevented. Output is also prevented in the descendants of the window.

rc (BOOL) - returns

Success indicator.

TRUE

Successful operation.
FALSE
Error occurred.

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