Who know the difference between the two Timed Loop structures in NI's examples named PAC Simulation.vi?

My LabVIEW version is LabVIEW 8.0.
When I look up the help document about Timed Loop, I find two examples about Timed Loop with the same file name and different file path.
One is "labview\examples\general\plat-timedloopframes.llb\PAC Simulation.vi",
and the other is "labview\examples\general\timedloop.llb\PAC Simulation.vi".
The function of these two examples is almost the same. But they display different results when running. I debug them and find that the value of Actual Start [f] of these two timed loop is different. Its value is constand in one vi and increasing in another vi. But the configuration of these two timed loops is the same.
Can anyone tell me the diffrence between these two timed loops?
Thanks!

After I posted this, I realized there was one more "Time" clock, namely the Time node on the Event structure. How is this clock (which I will call ET, for Event Time) related to the Global Start Time (or GST) and the TimeStamp (TS)?
ET represents time in milliseconds, using a U32. The largest value that can be represented is roughly 4 billion, but there are more than 30 billion milliseconds per year. Hence this "clock" cannot directly keep the same time as the GST or TS.
However, on the PC, if you multiply the ET value by a million (thereby converting the time to nanoseconds) and compare this value to GST, you'll see they are basically the same. Thus, on the PC, ET and GST are "in sync", but not in sync with TS.
On a real-time PXI system, we already established that TS and GST are "in sync" -- what about ET? Curiously, this does not seem to be synchronized with anything.
A Word to the Wise -- when I originally added the Event structure, I synchronized it with the Timed Loop using a Value(Signalling) property node, which worked fine on the PC, but failed to fire on the PXI. I'd forgotten that you can't use this trick on real-time systems, as they have no Front Panel objects, hence the implementation using Dynamic Events.
Attachments:
TS GST ET VI.png ‏16 KB

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