I have two working PCs with the same MAC address!
How do the packets figure out which computer to go to?

I have been travelling with two computers for weeks now staying at some
German hotels whose wireless ISP sync with the MAC address of the wireless
cards on my computers so I used MacMakeUp to make both computers have the
same MAC address as I get my home email on my home PC and I get my work
email on my work PC. Up until today, I was careful to boot only one
computer at a time.

I'm currently in a hotel in the UK which has free wireless to any MAC
address and I forgot to reset the MAC address on the second PC back to the
original. Both computers seem to be working wirelessly.

How can that be?

How can I have two working PCs with the same MAC address?
Why don't the packets get confused as to which computer to go to?

Jette