Embodiments of the invention are concerned with facilitating service provision between software applications. In embodiments of the invention, a first user terminal includes an application which causes the first user terminal to delegate execution of a first service to a different application. In response to determining that the first service is to be executed on behalf of the first service, a request message is sent to a data store including an identifier of the first service. The data store comprising entries indicating applications held on one or more user terminals, and indicating one or more services that may be executed, on request, by a corresponding application. The first user terminal receives a response message from the data store identifying one or more applications to which execution of the first service may be delegated.