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Wireless Touch Panel applications consist of a client and a service. The client is the Touch Panel application that monitors or controls remote services over the network and communicates directly with a service on a server or another device. Services are VIs or other applications that perform tasks that the client accesses. For example, a service might be a VI that monitors temperature or tank level. The client might be an application on a Touch Panel target that uses the TCP Open Connection function to connect to a remote service on the network and then uses the TCP Read function to read the temperature or tank level data that the remote service broadcasts over TCP. You build service VIs just like any other VI.