Instant messaging to multiple subscribers

With which of the popular instant messaging services(MSN,Yahoo,ICQ...)
can you send a message at the same
time to multiple subscribers ?

 

You can with MSN...I don't know about the others but I think I have heard you can do it with Yahoo also.

 

check out trillian (http://www.trillian.cc) they can do it to multiple people and IM services.

Cash