Need help clarifying client/server TNS communication

Im trying to get a clearer understanding of service/listener registration in the Oracle client/server architechure. Feel free to point out errors in my understanding.
When an Oracle client connects to the server, it forms its connect descriptor based on the clients tnsnames.ora file. The client then checks the specified port on the host in the connect descriptor for a listener that is registered with the service defined in the
(CONNECT_DATA =
(SERVICE_NAME = TESTSERVICE)
portion of the client's tnsnames file. Correct?
Does the listener gets its list of SIDs its registered with from the SID_LIST section of the listener.ora file or the tnsnames file?
If the listener gets its list of SIDs to register with from the tnsnames file, is that the tnsnames file on the server?
If so, then what is the SID_LIST used for in the listener.ora file?
Im trying to connect the dots and any help would be much appreciated.
Thanks,

Reading below documents would help you understand how client/server TNS communication works:-
Listener Architecture
http://download-east.oracle.com/docs/cd/B14117_01/network.101/b10775/architecture.htm#sthref445
Configuring Naming Methods
http://download-east.oracle.com/docs/cd/B14117_01/network.101/b10775/naming.htm
Configuring and Administering the Listener
http://download-east.oracle.com/docs/cd/B14117_01/network.101/b10775/listenercfg.htm

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http://forum.java.sun.com/thread.jspa?threadID=574466&messageID=2861516#2861516

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http://forum.java.sun.com/thread.jspa?threadID=574466&messageID=2861516#2861516

Need help clarifying client/server TNS communication

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