Session object?!

ok, ive got a number of products which are stored on a page, when a link is clicked the corresponding product information is passed using “querystring”

then when the user clickes on the add to basket button I want the information passed in the querystring to be stored in a session object, i really dont know how to do this

how do I set a session object?
where do I need to set it?
how do I store values in the session object?

any help again pleeeeeeese!!
:pleased: