Session help needed.

Im new to using sessions.
I have read that u can check if a user already has an assoiated session, by doing
'request.getSession(true);'
which will create a session if there already isnt one.
Well what if there is one, and i want to kill it, and start a new one?

Ok, what i really need is some info on sessions themselves. The book i have isnt very good for it (well not to me).
I dont think i understand them properly.
Q1. Do sessions exist before they have been manually created?
Q2. When is a session created?
This is the first time i have dealt with sessions before, so am clueless. If anyone can offer me some advice, or point me towards a VERY good guide about seessions, i would be very greatful.
Thankyou

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