A file comprising an application and data corresponding to a status of the application at a particular time is maintained in a first memory of a user device, the first memory comprising a persistent storage. The application may be a software application, for example. In response to a request, the file is transferred to a second memory of the device, the second memory comprising a random-access memory. The file is activated, or set up, as a running application. The user device may be a cell phone, a wireless telephone, a personal digital assistant, a personal computer, a laptop computer, a workstation, a mainframe computer, etc. In one embodiment, the file is brought to a foreground of the user device.