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So, if I interpret the linked Microsoft page and the table at the bottom of the page correctly, than Vista 32 and XP 32 make use of upto 4GB anyway
and the 3GB switch doesn't have any effect at all on those operating systems.

Can anyone verify this? I don't want to start poking and prodding at the intestines of my computer if it doesn't matter anyway...

Pakled, I've occasionally set Poser to a higher priority while rendering something. Never seen any noticeable effect of it though. It's easily done on a case -to-case basis from Taskmanager, by rightclicking on the process. And the startup switch to set Poser permanently in High Priority was mentioned in another thread recently :)

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.