Can someone decode this diagram of a shared server?

Hi.
This diagram
http://esupport.csci.unt.edu/oracle/server.901/a90117/manproc.htm
of the Oracle Shared Server setup is quite useful but I would like to ask anyone here to tell me what the numbers 1 and 7 , and 4 represent.
Im thinking that between 1 and 7 we have the user process.
And that for number 4 we have the server process.
Cheers.
DA

I believe these number is used to demonstrate the sequence of shared server flow.
1. User application called to dispatch process to request for connection
2. Dispatch place user request to Request Queue
3. User request is served by Shared Server Processes
4. Making necessary interaction with SGA, buffer cache, shared pool etc
5. After request processed, result place to Response Queue
6. Result was routed to Dispatch process
7. Served back to User Application

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    Attachments:
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