>>>>Just trying to wrap my brain around this stuff: The way I'd invent it if anybody cared to ask < s > is to have an referee-type object that would be responsible for the cross business object communication. Does that make any sense?
>>>
>>>Yup. A mediator.
>>
>>Agreed.
>
>OK, I buy that also. But I guess I see the mediator as being of the same level (middle tier) as my business objects, and not really a higher level object. I guess I just read more into the original comment I responded too as I did my own brain wrapping around thread :)

Saying 'another level' I meant different thing: application hierarchy. For example, if you have two form objects and you want to provide communication between these two forms, then you use some property/methods of higher level object (e.g. oApp).