A method and system for flow control in a reliable multicast communication protocol, in which a transmitting device transmits sets of multiple data transfer units referred to as \u201cbursts. The method also includes forwarding the telephone call, from the proxy device, to a first voice portal and determining that telephone call should be transferred to a second voice portal. In a second embodiment a finger slide on the frame drives a cord lift system for moving the covering between open and closed positions. The putter has an aiming mark that has a minimum area and a minimum length-to-width ratio and is brightly colored. When depressed, the trigger connects the electrode to a radio frequency generator. A spring biased plunger has collapsible elbows which, when the plunger is released, initially engage the end of the syringe to drive it to the projecting position, whereupon arresting of the syringe movement causes the elbows to collapse inside the syringe to allow the plunger to engage and drive the bung.