"MouseGrid" enables users to control the mouse cursor by overlaying numbers across nine regions on the screen; these regions gradually narrow as a user speaks the number(s) of the region on which to focus until the desired interface element is reached. Users can then issue commands including "Click "number of region"," which moves the mouse cursor to the desired region and then clicks it; and "Mark "number of region"", which allows an item (such as a computer icon) in a region to be selected, which can then be clicked with the previous "click" command. Users also can interact with multiple regions at once.