Communication between middle tier and infrastructure

Hi!
We have seven OAS machines with two infrastructure-instances and seven middle tier - instances which use these infrastructure.
My short and simple question is: how does the communication between the middle tier and the infrastructure work? is there any file on the middle tier where you can see which middle tier is assigned to which infrastructure? there is no entry in the tnsnames.ora and i can't see any hint in the opmn.xml ...
Regards

If you just want to see which midtier is bound to which infrastructure you can check $ORACLE_HOME/config/ias.properties . This doesn't explain how communication works though.
The process is roughly sad like this:
Every midtier has a dcm-daemon. This daemon contancts the infrastructure upon start, stop & restart automagically. Next to this the daemon also contacts the infrastructure if you make changes using the enterprise manager website. If you make changes manually, you have to for the daemon to contact the infrastructure by issuing dcmctl configupdate (of updateconfig, this I mess up all the time ;) )
The infrastructure stores certain parts of the configuration in the metadata repository, other parts are replicated to other components in the farm (e.g. if you created clusters).
Communication is made by issueing secure ldap statements on port 636.
This is just the basics. For more insights you either have to start reading manuals / metalink or contact an expert ;)

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