VIS is continuously capturing video - you just tell it which segments to keep. Any time the video screen open, VIS is capturing what playing in it. You tell VIS which video clips to keep by defining how many seconds before and after a triggering keystroke you want to save. The number of seconds before and after is set in Edit/Setup under the Video tab. The VIS default trigger keystroke for capturing video is the Enter key. Enter can be pressed on either the main keyboard or the number keypad.
For example, most golf swings are less than four seconds. You might set VIS to trigger on the ball strike and capture 3 seconds before and 1 second after the triggering keystroke. You press Enter when the golfer strikes the ball and VIS will grab previous 3 seconds and 1 second after. This four second movie clip is placed in a new window.
Or, you might set VIS to capture the four seconds before the trigger, and then you would simply press Enter at the end of the swing.
In summary: