A computer-implemented method being performed in connection with a mobile computer system comprising a central processing unit, a touchscreen and a memory, the computer-implemented method comprising: detecting a gesture performed by a user across the touchscreen, where in the gesture comprises a plurality of unidirectional or circular motions performed by the user over substantially the same area; determining at least one characteristic of the detected gesture; and selecting a command for execution by the central processing unit of the mobile computer system based on the at least one determined characteristic of the detected gesture.