In this paper we present a novel method of simulating mouse clicks while the cursor is navigated by head movements tracked by webcam. Our method is based on simple hummed voice commands. It is fast, language independent and provides full control of common mouse buttons. Our method was compared with other three different methods in an experiment that proved its efficiency by means of task duration. Keywords Non-Verbal Vocal Interface, Voice Interface, Head Tracking, Accessibility, Comparative Study ACM Classification Keywords H.5.2 Information interfaces and presentation: User Interfaces