kk, once again
The UID = the User Identifier. It is located in windows/.Jagex_cache_32/UID.dat.
It enables Jagex to associate your Players with your computer. If you dont delete the UID.dat regularly, ALL your Players are associated with the SAME computer. Easy enough to ban all your accounts like that.
Once you delete the UID.dat, the next time you log in
signed, you will recieve a new UID.dat on your HD.
If you log in
unsigned, no files will be written to your HD, effectively you recieve a session UID, that is gone once you quit the client.
I always trade with one signed client, and one unsigned client, and I always delete the UID from HD afterwards.
There is plenty of further info @ this board concerning UID's.
hope this helps. Too bad they caught you....