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FreeSignal -- free a signal bit
FreeSignal(signalNum)
D0
void FreeSignal(BYTE);
This function frees a previously allocated signal bit for reuse.
This call must be performed while running in the same task in which
the signal was allocated.
Signals may not be allocated or freed from exception handling code.
Starting with V37, an attempt to free signal -1 is harmless.
signalNum - the signal number to free {0..31}.
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