Nothin' Stopping You
Yes you absolutely can. There are a couple ways of doing this. 1) you can let the EFI sort it out and use the hold down option boot selection or startup disk OR 2) you can use boot.ini to sort out where you're booting from on the windows side. Option 1 is probably preferable
Can i run xp 32 and xp 64 in the same macpro, have them both installed at the same time like a dual boot?
Yes you absolutely can. There are a couple ways of doing this. 1) you can let the EFI sort it out and use the hold down option boot selection or startup disk OR 2) you can use boot.ini to sort out where you're booting from on the windows side. Option 1 is probably preferable