Routing using lang file

[eluser]Ngulo[/eluser]
Hi all guys,

i'm newbie and i would like to route my urls according to a session param which load in my controllers main lang file,

how can i retrieve this lang file in route.php ?

is it possible?

then i'm trying to route this url: http://localhost/asd/index.php/products/category/85
taking examples from CI ufficial guide but i'm not able to make them works

do i need to remove index.php from urls?

thanks guys