I need a bit of theory: How are connections to the db created

Hi
I need network / docs resources to explain how connections to the oracle are made. Strangly enogh I can find it nowhere!
Thanx in advance
Paul

http://download.oracle.com/docs/cd/B28359_01/server.111/b28318/toc.htm
and/or
http://download.oracle.com/docs/cd/B28359_01/server.111/b28310/toc.htm

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