A client-server computing system includes a server that has a virtual display driver that classifies and, if necessary, translates graphics application programming interface functions to a cross-platform format. The apparatus 10 also has a locking pin 40 that can slide vertically to lock the clamps 19 in an upright position. In the partially installed position the arm snugly engages in the connector, the connector is snugly fitted in the seat, and the arm is out of engagement with the pivot. In one embodiment, the fluid interconnection is made between the print cartridge and the ink tube simply by placing the print cartridge into a stall in the scanning carriage.