How to use request variables rather than session variables

Are there any good examples? , I am constantly adding too many session variables in the fear they will get 'crossed over'.
Like when you spawn new windows.
how to refresh a page when the variable was passed on the URL.?
A guide with all the varible passing methods woulbe be great.
Regards
Jonathan.

See the other post:
http://swforum.sun.com/jive/thread.jspa?threadID=50091&tstart=0
The problem is when the page is reloaded when a button is pressed for example, the URL variables are gone.
I know to to retrieve the variables, just having problems putting it all together.
I'm trying to avoid using session varibles.
Regards,
Jonathan

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