Quote - The 3GB switch gives the OS 3GB not the application.  If the application can address 3GB, it can use it.

That's wrong. The 3GB switch tells the OS to only use 1GB of each process instead of 2GB. The OS itself can use more than 2GB without the 3GB switch... > Quote - Well, I don't know what to tell you, because many times I've seen Poser 7 take >2GB of memory under XP 64 with no special configuration change...  I guess it was compiled with that option ^_^

Yes, it was > Quote - Perhaps more strangely, I have frequently seen Poser 7 take >3GB of Virtual memory and still not crash (although not much beyond that, seems to die around 3.6-3.7GB).

No, that's not strange as large address aware apps get 4GB on Win64.