Why does sub-second response time matter for user input? Does it really matter who posted something "first" to within a hundredth of a second? If not, consider using time (to the nearest second) plus something like the current process ID. That should take care of any collisions:

$GUID = "$^T$$";

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Not sequential, but do you really need it to be?

In reply to Re: Sub-second Timing in Timestamps by turnstep
in thread Sub-second Timing in Timestamps by Dunx

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