Abstract: A system and method for performing single sign-on authentication for networked applications. A system for integrating networked applications via an application shell is described. In response to a user utilizing a client program to access a master server and provide the master server with information identifying the user, the master server returns code usable by the client program for running the application shell. The application shell may be operable to intercept user attempts to launch an application from the application shell environment and may in response determine invocation parameters to send to the application, which the application can use to automatically authenticate the user.