The allocate and free counts track the port sharing of the parallel port. If the allocate count equals the free count then ...

The allocate and free counts track the port sharing of the parallel port. If the allocate count equals the free count then the port is idle. If the allocate count is greater than the free count (free count + 1) then some other driver in the system has acquired exclusive access to that port. If the allocate count stays constant at freecount+1 for an arbitrarily long period of time, then some driver may have illegally locked the port preventing other drivers from accessing the port.
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