Abstract: Aspects of the present disclosure relate to the sharing of synchronization information corresponding to content among devices in a communication network. An originating device collects synchronization information related to the presentation of content to a user via the originating device. The synchronization information is defined according to reference points related to the presentation of the content to the user via the originating device, including a current state of the presentation of the content and/or additional information obtained during the presentation of the content. Based on detection of a synchronization event, the originating device transmits the collected synchronization information, resulting in the receipt of the synchronization information by one or more receiving devices. Thereafter, the presentation of the content to the user on one of the receiving devices can incorporate the synchronization information collected and transmitted by the originating device.

Abstract: A system to determine the instantaneous position of a vehicle (11) which is attached to a track (12) by a mast arm (13) includes sensors (17, 19) to determine the location of the point (A) at which the arm (13) is attached to the track (12). An additional sensor (32) provides a signal to a circuit (47) which also receives signals from sensors (17, 19) and then locates the lateral and longitudinal position of the vehicle (11) with respect to point (A). Once the instantaneous position of the vehicle (11) has been established, a signal representative thereof is compared with a reference signal and the vehicle is controlled accordingly.