1. A method for launching applications into existing isolation environments executing in user sessions hosted by a server computing device, the method comprising: receiving, by a run module comprising software executing in a user session hosted on a server machine, a request by a user to execute an application; identifying, by the run module, a profile associated with the application; querying, by the run module, an application delivery service executing on the server computing machine to identify at least one isolation environment corresponding to the profile; receiving, by the run module from the application delivery service, a response identifying a first isolation environment executing in the user session, the first isolation environment associated with the application; and issuing, by the run module, a command to a launch module comprising software executing in the first isolation environment on the computing machine to launch the application into the first isolation environment.