About session_id

Hi all,

can someone please tell me out of which session_id is made of?

I need an answer because all of my visitor add products to a cart
table and these entries must be unike for each visitor. What I mean is
if visitor A adds 4 products to a cart within 2 hours or so they all
have to be conected to him with value of his sessionID (custom made or
not).
When I was using pure PHP my (custom) session_id was generated as md5
(ip address, user agent, and acquired php sessionId ). That way I was
pretty sure that 2 users will almost never get the same value

I want to be sure that server/application will not generate same
session id for at least 2 weeks.

I don't know if this changes anything but y session handling in config
is set to PHP and not Cake

Can you provide me some guidance, please...

thanks
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