How to close all running threads

I have many threads running everywhere in my application. when i disconnect from server, all sockets between me and the server must disconnect. but since different threads are having a socket connection each to the server, i cant close them all, since i dont have the reference to the diff thread objects.
how do i close these sockets (each whole thread) ?
Regards,
Sid

Thanks for replying.
but i figured out the way last night itself.
i was trying to fire a text changed event and putting a listener for it in every running thread so that when i want to disconenct, i would write some text into the textbox which would fire the event and the threads would listen to itr and kill themselves. but it simply wasnt workin.
then i came across the class ThreadGroup. add each thread to that threadgroup adn say ThreadGroup.stop();
Thanks anyway.
Regards,
Sid

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