A novel method and apparatus is disclosed for synchronously delivering complementary data to two devices. Complementary data is used herein to designate at least two streams of related data that, when combined, form an organic whole. In one embodiment of the disclosed invention, a command is received through a network for the synchronous transmission of complementary data. Subsequently, first data is transmitted through the network to a first device synchronized with transmission of second data to a second device, wherein the first and second data are complementary data.In one embodiment of the invention, a mobile and/or hand-held device such as a PDA is used to control another device remotely through one or more networks, such that complementary, synchronous streams of data that are intended for observation in combination by users and/or entities, can be transmitted to each of the PDA and the device. The flexibility of such an arrangement, wherein the PDA can be carried to different locations to control different devices for synchronous transmission of complementary data, allows the provision of a multitude of services not heretofore available.