I wish this helpful for you With eax set to 1, the cpuid opcode will return the processor type, familly, etc in eax, and the processor features in edx. So what you will get is not something unique, like the CPU serial number.
I wish this helpful for you I/O Connectors are on the rear of the motherboard (outside of the case), therefore you can plug external devices in such as keyboards, external hard drives etc. Internal interfaces are on the inside of the motherboard - I usually refer to these as headers as they aren't a "USB" (or other type of) port as such. You would actually plug a "memory card reader" or something like that into these. Hope this helps.