trying to understand the terminology of 'Core 2 Duo'. is this a single Intel 'core' with 2 processors each or 2 Intel 'cores' with 2 processors each? the MacPro comes in configs of 'quad' and 'octo'. is the new iMac a 'quad', or does Core 2 Duo mean it is a 'dual' processor in regards to the old single processor Macs? there's now talk of 'Quad-Core' Duo's in the future? thanks for your help!