Virtix Arsenal for iMovie allows you to place special effects at a position on the screen and change that position over time, using a technique called keyframing. You can use this technique to make the effect match up with your scene as the camera moves or as the people move, adding a professional realism to the effect. You can even trace the Laser effect onto a "sword" to create a light saber duel. The Laser and Machine Gun effects have controls that allow you to add realistic 3D perspective to your iMovie masterpiece. You can use the movable, keyframeable positions in Virtix Arsenal with the Arrow, Spotlight and Witness Protection effects to draw attention to a person or hide their identity, and move the effect as they move. This software package is less than 1 Meg in size (about a 3 minute download over a 56K modem). Virtix Arsenal works with iMovie 2, 3 & 4 and OS 9 & X.