Hi, AFAIK there's no standard for that, but you can use some proprietary means instead. You also have to be able to modify your client programmically... Say, you have a job running on your server, which continuously queries "location" table, checking for new registrations from the same account. Whenever you encounter 2 or more such registrations, you can use FIFO to send some sort of special message (MESSAGE, NOTIFY - the later actually needs a dialog established before, but since it's proprietary, noone cares ;-o ) to the client. When a client sees this message, it has to unregister immediately. That's all. I suppose, someone esle has a better idea, actually... Anyone, plz? Regards, Andrey. On 10/2/06, Abdul Qadir <ablqadir(a)yahoo.com> wrote: