Routing with parameter and parameter not included on URL

I've seen a few examples about routing using parameters, but the parameters are included on the URL.

Something like this example:

Request to /Default.aspx?lk=login  ==> route to /Auth/Login.aspx

Request to /Default.aspx?lk=CHPass==> route to /Auth/ChangePassword.aspx

This meant that on Application_Start I'll read from a table with the short name and the real URL, and make all the routes, and maybe a sessions flag to avoid attempt add to duplicated routes.

Is it possible make something like this?