The only way to "change the location bar" is to issue a HTTP 301 (or HTTP 302) redirect, which, unsurprisingly, is done with the ->redirect method. This has the "drawback" of generating a second request to your server, but has the advantage that your application is guarded against users reloading a page in the browser window.

Update: Upon readong phaylon's reply, I realized that you want to keep the user information and have no session set up yet, so before issuing the redirect, you need to create the session for the user, preferrably by one of the modules that phaylon linked to.