Abstract: Apparatus including: hand-controllable signal-generating device that includes body having top side, and bottom side spaced apart from and facing away from top side, bottom side being configured for facilitating displacements of body over working surface in two-dimensional directions, body having biaxial-displacement detector configured for generating biaxial displacement signals representative of displacements of body in two-dimensional directions; and signal transmitter configured for communicating biaxial displacement signals to external electronic processor. Body has palm rest on top side; palm rest includes palm contact surface having contour for receiving portion of palm of person's hand into contact at position on palm contact surface. Contour of palm contact surface is configured for facilitating control by portion of palm of person's hand, being in contact at position on palm contact surface, of displacements of body in two-dimensional directions over working surface.

Abstract: Apparatus including: hand-controllable signal-generating device that includes body having top side, and bottom side spaced apart from and facing away from top side, bottom side being configured for facilitating displacements of body over working surface in two-dimensional directions, body having biaxial-displacement detector configured for generating biaxial displacement signals representative of displacements of body in two-dimensional directions; and signal transmitter configured for communicating biaxial displacement signals to external electronic processor. Body has palm rest on top side; palm rest includes palm contact surface having contour for receiving portion of palm of person's hand into contact at position on palm contact surface. Contour of palm contact surface is configured for facilitating control by portion of palm of person's hand, being in contact at position on palm contact surface, of displacements of body in two-dimensional directions over working surface.

Abstract: Apparatus including: hand-controllable signal-generating device that includes body having top side, and bottom side spaced apart from and facing away from top side, bottom side being configured for facilitating displacements of body over working surface in two-dimensional directions, body having biaxial-displacement detector configured for generating biaxial displacement signals representative of displacements of body in two-dimensional directions; and signal transmitter configured for communicating biaxial displacement signals to external electronic processor. Body has palm rest on top side; palm rest includes palm contact surface having contour for receiving portion of palm of person's hand into contact at position on palm contact surface. Contour of palm contact surface is configured for facilitating control by portion of palm of person's hand, being in contact at position on palm contact surface, of displacements of body in two-dimensional directions over working surface.