Abstract: A position tracking system has a laser transmitter, a control tracker and a layout indicator. The laser transmitter has a laser for emitting a laser beam, a controller controlling the laser, and a motor for rotating the emitted laser beam. The control tracker has a housing, at least two photo diodes disposed on the housing, and a laser assembly for generating a beam to be projected unto a surface. The layout indicator has a housing, and at least two photo diodes disposed on the housing. A network server communicates with at least one of the laser transmitter, the control tracker and the layout indicator.

Abstract: A technique is disclosed that enables one or more telecommunications endpoints to subscribe to a conferencing system and to be notified of one or more conferencing events. As part of the conferencing system of the illustrative embodiment, a conference invitation server maintains information on all of the conferences that are scheduled to occur on the conferencing system, including (i) the addresses of the identified participants for each call and (ii) the conference identifier that the server generates for each call. When a conference call is going to begin, the server sends out notifications to all endpoints that are subscribed to the conference. If there are participants who are not subscribed to the conference, then alternative mechanisms for notifying participants can be used. Each subscribed endpoint then transmits a request to join the conference—either via user interaction or automatically—providing the conference identifier as part of the join request.

Abstract: A server or servers and a method of operating a server or servers to establish a conference call includes determining parties to be joined into a conference call, notifying the parties about the conference call, authenticating parties that responded to the notification about the conference call, and bridging the parties that have been successfully authenticated into the conference call.