A self-service terminal system (10) is described. The system (10) has a plurality of terminals (14 or 214), each terminal comprising a user interface (30) and a terminal application (38) for controlling the user interface (30). Each terminal (14 or 214) has a link (16) to a remote server (12 or 212) storing a server application (104 or 260) for issuing to the terminal application (38) requests for using the user interface (30). A user of one of the terminals (14 or 214) is able to access the server application (104 or 260) from the terminal (14 or 214). The server application (104 or 260) is able to use one or more of the facilities (50, 56, 58) provided by the user interface (30). Each terminal is operable to select between presenting the terminal application or the server application to a user. A method of hosting a third party application on a self-service terminal is also described.