However, when using sites like facebook, I notice that I receive emails with links that pnce clicked automatically take me through the verification process (i.e. check my cookie and if not set allow me to logon) and then take me to a specific page, i.e. http://somedomain/somesubfolder/somefile.php?something=lotsofnumbers
I am assuming this page does not actually exist on the server, and the url and numbers somehow work with the session to identify the user then compile the correct data for the user to view.
I would like to implement a similar methodology but have no idea of where to start or to start reading.
Can someone point me i the right direction please?