Abstract: A rate-of-change mouse (420, 720) positions a cursor (388, 724) of a display device or monitor (390, 726) in response to a user actuating transducers (16, 17, 422A, 422B, 722A, 722), and performs switching functions, such as left click, right click, or click and drag mouse-switching functions, when a rate-of-change of an electrical signal of one of the transducers (16, 17, 422A, 422B, 722A, or 722B) exceeds a predetermined limit. In addition, macro select, “hot key” actuation, and any other selected switching functions are actuated by moving a body member such as a head (18), hand (64), or finger (67) more rapidly. Optionally, more rapidly actuating one or both of the transducers (16, 17, 422A, 422B, 722A, 722B), in selected directions and/or in selected sequences, accesses and controls augmentative and alternative communication devices (AAC) devices, environmental control units (ECUs) (14), and/or accesses and controls power wheelchairs (12), and/or accesses and controls other apparatus (26).