Peregrine, that's almost but not entirely true. It's possible to use up to 4GB with a 32-bit LargeAddressAware app on a Win64 system with more than 4GB installed. Win64 will use the memory above 4GB and allow for a full 4GB load in the 32-bit app as the address space won't have to be split up into system and user parts like in Win32.
/Mattias
/Mattias