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The system will unblock input in the following cases:
The thread that blocked input unexpectedly exits without calling BlockInput with fBlock set to FALSE. In this case, the system cleans up properly and re-enables input.
The user presses CTRL+ALT+DEL or the system invokes the Hard System Error modal message box (for example, when a program faults or a device fails).
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If the function succeeds, the return value is nonzero.
If input is already blocked, the return value is zero. To get extended error information, call GetLastError.
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