A method for executing a target program that includes opening, in response to a request, a door between the source container and the global container, where the source container is controlled by the global container and the request specifies a target program. The method further includes sending the request to an access module located in the global container using the door, verifying that the request can be executed in a target container using a policy definition, where the target program is in the target container and the target container is controlled by the global container, logging in to the target container after the request has been verified, initiating a gateway within the target container in response to the login, setting an execution context of the gateway based on the policy definition, and executing the target program by the gateway, using the execution context, to generate a response to the request.