public boolean multiUser () 

This method must returntrue if communication with several intelligent business objects is possible through the channel. In this case a message sent through the channel must identify the recipient of the message. For example, the E-mail channel allows communicating with several recipients (a message contains an e-mail address of the recipient) whereas a dedicated channel handling the protocol specific to some software system is probably not multi-user.

If this method returns true intelligent business objects communicating through this channel must have a certain attribute defined (such as an e-mail address). When the message is sent to the recipient through the channel Aware IM automatically gets the current value of this attribute from the instance of the business object and writes it into the message. See also the getChannelValues method in the MessageInterpreter class and the getreceiverentityattribute method below.