sessions/several users

[router]

Hello!
I'm working with php 4.2 and i'm using sessions.
If i have a server and there's more than one user, how will the server know wha is the valid session for each user???
Using cookies with session id or similar? and if the user doesn't accept the cookies?
Actually, in my pages, i only start a session (session_start), but i don't see what session must use, does the server know?
Maybe it sounds stupid, but i have no idea....
any idea will be welcome!
Thanks very much!
Router

[filch]

Well, I am relatively new to sessions and PHP in general but I believe that PHP automatically assigns a new session id for each user. Therefore, if the user does not allow cookies you can use this session_id() that is generated.

Perhaps someone who knows a bit more about this can make this clearer?

Dave