Comet help about code

I read the comet in
http://code.google.com/p/gwt-comet/source/browse/trunk/src/net/zschech/gwt/chat/server/ChatServiceImpl.java?r=98

Can explain to me about the code, because i dont undestand:

public void send(String message) throws ChatException {

.
.
.

for (Map.Entry<String, CometSession> entry :
users.entrySet()) {
entry.getValue().enqueue(chatMessage);
}
}

thaks

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