try to contact erik, the fellow that runs this site. He's very big on catching cheaters, and has a way of weeding them out (don't ask me how he does it). This was a big issue a couple of years ago.
I know this is not the best place to answer .. but can anyone point me in the right direction for study how can anyone determine of a chess software is used in game or not?
thx - but there is also a way to send a general message out to individual members - sort of a "bulk mailing" if you will. That's how I've received invites to other groups