The Core 2 Duo Macbook Pros have a 64-bit Intel processor right? I'm pretty sure what 64-bit means, but i still have questions: 1. OS X Tiger isn't completely 64-bit right? 2. Leopard will be more 64-bit capable than Tiger is right? 3. Referring to the 2nd question, will Leopard technically perform faster than Tiger? 4. Could I install 64-bit Windows Vista right now?