Hi Eli,
You can integrate Windows GUI inside the web ui frame by using ZAPP_INTEGRATOR (http://wiki.sdn.sap.com/wiki/display/ABAP/ZAPP_INTEGRATOR and https://cw.sdn.sap.com/cw/groups/zappintegrator)
For reference you can check http://scn.sap.com/thread/3392747 thread.
Regards
Vijay