1. A multimode touchless human machine interface (TLHMI) comprising: one or more touchless sensors to sense a position or a movement of a subject portion within a sensing zone of said one or more sensors; a tracking engine to receive an output of said one or more sensors and to track a position or movement of a portion of a computing platform user within the sensing zone; a user input generator to convert an output of said tracking engine into signals indicative of a user input and to provide said user input signals to a functionally associated computing platform, wherein said generator is adapted to generate: (1) a first output signal in response to a given tracked motion type while the TLHMI is operating in a first mode, and (2) a second output signal in response to the same given tracked motion type while the TLHMI is operating in a second mode; and a mode transition module to monitor an output of the one or more sensors or of the tracking engine and to identify one or more mode transitioning parameters within the tracked motion.