Server Administration :: Database Resident Connection Pooling?

[URL]... says that session memory is maintained in the PGA (unlike shared server) and then gives a calculation for memory usage that I don't understand: it suggests that instead of there being one PGA per session, there is one PGA per pooled server plus a small allocation of 35k per session, but this is not what I see.

It's easy to demonstrate. As sys,
exec dbms_connection_pool.start_pool
and then launch any number of session with
sqlplus scott/tiger@127.0.0.1:1521/orcl:POOLED
and you'll see a process called Lnnn launched for each session:

[code]...

There is a mention of a process called the connection broker, but I can't see this in v$process.There is more detail in the OCI developers guide [URL]... which goes beyond my knowledge of application development.