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267 Resource Usage The interval counter is driven off of the real time clock. If interrupts are disabled for long periods of time, the timing won’t be accurate. I/O routines that disable interrupts typically track RTC ticks and then update the RTC when the I/O process has completed. At this same time, the interval counter will be updated as well accounting for, at most, one missed expiration. There is a single, system-wide interval timer. Only one task can be awaiting an interval at a time. If a task is already waiting, another call to WaitForInterval() will return immediately. Compatibility This routine is not available in BasicX compatibility mode. See Also SetInterval