I'm a new Ping Plotter user but I know a good bit about WinNT time stuff. When you see increments of 10ms, it is presumably due to the resolution of WinNT's clock on the typical machine. The increment is actually 10.0144ms, and therefore rounding would explain why you sometimes see occasional 51 or whatever. The resolution will most likely be a little less (around 15.6ms) on typical multi-processor machines, and a little bit better (around 7.8ms) if you have old DEC Alpha machines.<br>Although the clock resolution won't increase, to get better timer resolution a programmer can call API timeBeginPeriod(1) before using timer (and corresponding endperiod when done) to get 1ms resolution. Presumably that is what was done in the new option seen in Beta(?)<br><br>Commandline ping/tracert presumably are looking at clock time or using timer without asking for extra resolution (such feature was added shortly after initial release of WinNT).<br><br>