http://forum.pigeonbasics.com/m-1248460143/
We have had this discussion with Richard in the past, what happens if you get visitors who log on using one of our computers, Rembrant2coo, Valiant etc. I have also logged on at other members homes when visiting them. Also all our family log on from here so we all have the same IP address at times
I hope you take this into account as we have quite a few members that have more than one member of the family on the site