CLIQUES group key agreement questions

Hi,

Let's say we have machines A, B, C and D which have established a
group key by using CLIQUES.

Am I right in saying that the key established, K, is used among these
machines only?  In other words, whenever each machine communicates, he
will encrypt the message with the key, K.  Therefore, when A talks to
B or C or D, he would encrypt the message with K, and so on.  If so,
that means whatever is sent between A and B, C and D can intepret.

I understand that only ONE key is used for communication among the
machines.

Please clarify.

Thanks,