...
Notes
The system only does limited error checking. If the alarm is done, the symbol counter is decremented, and the done flag is reset. If the alarm is pending it is cancelled,
Related calls
GN_Aab, allocate alarm block
GN_Alp, process an expired alarm (internal OZ usage)
GN_Fab, free alarm block
GN_Lab, link an alarm block into the alarm chain
OS_Alm, alarm manipulation (internal OZ usage)