gmab and sarah: an ip address “can” change, but it happens pretty less often then you may think. unless you have dialup, its rare. now for you both to have the same ip address constantly after multiple postings, it is figuratively impossible, unless you are using the same computer, or atleast the same connection through a local router, as in a house, or public library.
to explain: gmab, you get a ip address designated to you on tuesday from your isp (ineternet service provider : verizon, cablevision, time warner, cox, etc). you turn off your computer for a week. now sarah had her computer off for a week, and in the next one to turn on hers. she gets said previously assigned address that expired after a week that was yours. now for you to get yours back, and to keep on going back on forth, which i will take is what the moderator is seeing, is near impossible. it is more likely that you are one and the same and/or in the same family and/or use the same network, either at work, or say in a library. trust the moderator is not a fool for seeing the same ip address and thinking you are one and the same. ip address designation is a pretty strong way of telling who is at a computer and when. admissible in court, no, but it is good forensic proof when given with other forms. police use it all the time.