a support for a computer or data entry keyboard includes a frame member having a pair of opposite sides disposed in a plane , a main platform member pivotably mounted to the frame member along one of the sides , and an auxiliary platform member pivotably mounted to the frame member along the other of the sides . cooperating connectors such as hooks , pins , locks , latches , snaps , etc ., releasably couple the main platform member and the auxiliary platform member to one another when both the main platform member and the auxiliary platform member are pivoted in a common direction out of the plane .