There is one timebase that might be available on your processor that doesn't obey the rules of "base timing resolution" we just described. Some processors have a high-frequency (high-accuracy) counter built right into them, which Neutrino can let you have access to via the ClockCycles() call. For example, on a Pentium processor running at 200 MHz, this counter increments at 200 MHz as well, so it can give you timing samples right down to 5 nanoseconds. This is particularly useful if you want to figure out exactly how long a piece of code takes to execute (assuming of course, that you don't get preempted). You'd call ClockCycles() before your code and after your code, and then compute the delta. See the QNX Neutrino C Library Reference for more details.