16. A system supporting remote control of a server-administered function, the system comprising: a network controller of a text messaging system, the network controller configured to receive multiple text messages; a server supporting the server-administered function and configured to provide a user with a service in response to the user communicating a registered identity, the server functionally distinct to the network controller; a communications network supporting at least transmission of multiple text messages, each text message including a recipient address and a sender address; control logic configured to make an assessment about each of said received messages to identify: i) as a relevant message, a text message that includes a self-addressed routing direction that includes common recipient and sender addresses, wherein presence of the self-addressed routing direction in the text message the registered identity and wherein the recipient address includes a mobile number of the sender address, and said text message further includes a body portion containing an instruction; and ii) other messages that do not contain any self-addressed routing direction and are messages that are unrelated to control of the server-administered function; wherein the network controller, responsive to the assessment, is configured to select each relevant message and to communicate at least part of each relevant message to said server, otherwise to cause the network controller to route over the communications network each of said other messages to said recipient address identified in that other message; and the server is configured to derive the instruction relating to the service supported by the server from a received relevant message and the server is further configured to support access to the service through a user device that was used to send the self-addressed routing direction by invoking the server-administered function based at least in part on the instruction derived from the relevant message, thereby to support access of the user to the service, and the service executing on the server is operationally responsive to the user device that was used to send the self-addressed routing direction, and wherein information relating to the service provided by the server is returned to the user device via the network controller.
16. A system supporting remote control of a server-administered function, the system comprising: a network controller of a text messaging system, the network controller configured to receive multiple text messages; a server supporting the server-administered function and configured to provide a user with a service in response to the user communicating a registered identity, the server functionally distinct to the network controller; a communications network supporting at least transmission of multiple text messages, each text message including a recipient address and a sender address; control logic configured to make an assessment about each of said received messages to identify: i) as a relevant message, a text message that includes a self-addressed routing direction that includes common recipient and sender addresses, wherein presence of the self-addressed routing direction in the text message the registered identity and wherein the recipient address includes a mobile number of the sender address, and said text message further includes a body portion containing an instruction; and ii) other messages that do not contain any self-addressed routing direction and are messages that are unrelated to control of the server-administered function; wherein the network controller, responsive to the assessment, is configured to select each relevant message and to communicate at least part of each relevant message to said server, otherwise to cause the network controller to route over the communications network each of said other messages to said recipient address identified in that other message; and the server is configured to derive the instruction relating to the service supported by the server from a received relevant message and the server is further configured to support access to the service through a user device that was used to send the self-addressed routing direction by invoking the server-administered function based at least in part on the instruction derived from the relevant message, thereby to support access of the user to the service, and the service executing on the server is operationally responsive to the user device that was used to send the self-addressed routing direction, and wherein information relating to the service provided by the server is returned to the user device via the network controller. 18. The system according to claim 16 , wherein the server is remotely located from the network controller and communication of at least part of each relevant message to said server is over the communications network.