A method of operating a self-service terminal is described, along with software for performing the method. The self-service terminal has a number of service providers installed on it. According to the method, a call from a self-service terminal application to open a session with a service provider is received by a manager module. The call includes details of a device related parameter, such as a logical service name or device class. Those service providers which can support the device related parameter are identified and then queried to determine if an associated device is present. Based on the results of the query, one of the service providers is selected and a session is opened between the self-service terminal application and the selected service provider module.