View source for Search Engine Friendly URLs

=== Handling SEF URLs === <!--T:39-->
By default the SEF URLs are handled by the ''JRouterSite'' object (from ''/includes/router.php'') and is invoked by a call to ''JApplication::route()'' in ''index.php''. This call is made on the ''$app'' variable which is actually an instance of ''JSite'' (from ''/includes/application.php'').

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''JApplication::route()'' has a non-destructive result on the ''$_GET'' array. That is, ''JApplication::route()'' sets variables in ''$_GET'' by calling ''JRequest::set()'' with the overwrite flag set to ''false''. Thus if a variable name is returned from ''JRouter::route()'' that is already in ''$_GET'', it will not put that value into ''$_GET''. This allows for custom routing.