We propose to describe in this paper, the use of voice in a multimodal environment. We particulary pay attention to the interaction between a Human and the Unix Operating System. This works want to highlight the need to improve the impact of speech recognition systems on Human-Computer Interfaces by the use and the complementarity of other media. This approach shows that ergonomic benefits and efficient interaction due to the use of multiple media, can reduce the gap between a user and a computer task.
Keywords: Multimodal Dialogue, Speech Recognition and Understanding.