ichat hidden user

Hello

After a system crash on one of our iMac i have a Problem. All Machines have User Home Directories because they are on the OD Server.

When We start the Machine as Administrator, the Machine is published 2 times in the Bonjour Network.

1) with the normal name

2) with the name and brackets (2)

Also in the LAN is a User visible which has a active iChat Session. I thnk during the crash the launch items are copied to the system/library.

Is their a way to kill all these iChat Session?

Regards

Gérard