A system and method of logically partitioning shared memory structures between computer domains is disclosed. The controller is operable to monitor a communication channel of the network for the receipt of a transmission of location-specific alert information from a transmitter servicing a geographical area and to operate the peripheral device in response to the reception of the transmission of the location-specific alert information to display the formatted text. The support member 24 includes a sliding drive portion which slidably supports the engaged portion of the rear link member 23 to allow the rear link member 23 to be swingingly displaced in conjunction with a longitudinal movement of the seat-cushion frame 2, so as to move the coupled portion 28 in an upwarddownward direction to drivingly lift and lower the rear end of the seat-cushion frame 2.