Ah yes, in regards to URL rewriting, imagine a function took the whole URL and split it up, if it find for example "users_id" in whatever.com/showuser/users_id/100.php then it would use from the slash after users_id to the end, if it sees .php remove it, if it sees / (due to more parameteres) then carry on collecting data. This could be made using your own load of functions but I suspect its a dodgy one to write... I think I may look into doing it myself.