[eluser]Grahack[/eluser]
I hope you'll find help [url="http://ellislab.com/codeigniter/user-guide/general/urls.html"]in the user guide[/url]. In fact CI doesn't work with the GET queries.
I don't know well [url="http://codeigniter.com/wiki/Calling_CI_models_from_outside_script/"]Calling_CI_models_from_outside_script[/url], but I made [url="http://codeigniter.com/wiki/dip_into_CI/"]this other way to use CI from external apps[/url]. The one I made will remember the GET query while in CI and reconstruct it back when coming back to your external app.
Maybe you could give it a try, or try to tweak Calling_CI_models_from_outside_script for it to play well with the GET array.
