A simple question

Anyone know what are the definitions that eVC++ uses to distinguish between the HPC/PPC/PsPC plaforms?
I know it defines something, I just can remember what!
Also, why does the HPC SDK have all the DirectX3 Headers?
cheers...
-gamefreaks
I know it defines something, I just can remember what!
Also, why does the HPC SDK have all the DirectX3 Headers?

cheers...
-gamefreaks