How can I programmatically determine my processor type?

Question

How can I determine programmatically whether my machine is an x86, x64 or an IA64?

Answer 1

On Windows Systems you can get the environment variable PROCESSOR_ARCHITECTURE. Here is an MSDN article explaining the values that can be returned.

PROCESSOR_ARCHITECTURE=AMD64
PROCESSOR_ARCHITECTURE=IA64
PROCESSOR_ARCHITECTURE=x86