Wow64

Just as Microsoft is planning to integrate Windows Over Windows (WOW64) to run legacy 32-bit drivers on Longhorn, by converting them to 64-bit counterparts, is it possible to run legacy 64 bit drivers on 32-bit Windows? WinXP for example? If it can, can u tell me about how to begin in Visual C++ and VB. NET

AFAIK wow64 already runs on the Windows XP 64-bit versions. And it's not really a converter. It's more like a stub, just like wowexec for running 16bit windows applications on 32bit systems (nt/2000/xp).

And no it not possible to run native 64bit code on 32bit systems. The other way around is possible because of backwards compatibility.