Join Date: Feb 2000
Location: Menlo Park, CA, USA
Programs: UA 1MM 0P, AA, DL, *wood, Lifetime FPC Plat., IHG, HHD
Posts: 6,912
most likely mac
most likely, they are recording your MAC address, not the IP address, which on most computers these days will be assigned dynamically, via DHCP.
Whereas, the MAC address is UNIQUE to every networkable device.
There are some ways to trick the system, by spoofiing MAC addresses, for example, I was in a four seasons the other day, PAID for the service but wanted my #1 1K GF to be able to use the network too. I didn't have my handy travel router with me, so simply spoofed the MAC address for her machine.