A document service request at a mobile computing device is carried out using at least two communications channels. The document service request includes a first parameter identifying a document accessible to a document server. Device information identifying a type of output device available over one of two communications channels is obtained at the mobile computing device and added as a second parameter to the document service request. The parameters of the document service request are transmitted from the mobile computing device to the document server over one of the two communications channels. The mobile computing device controls a connection between the document server and the output device by communicating with the document server over one of its communications channels and with the output device over the other of its communications channels to transmit there between the document in a format suitable for the output device.