When you create tutorial videos or live presentations of software you may want to have the viewer see where the mouse is at certain times throughout the video. Windows 7 has a pretty slick feature that you can enable in the Mouse dialog box. Enabling that option will then allow you to simply hit the CTRL key to get a visual indicator of where the pointer is. This is great for highlighting the pointer and also highlighting a button or a click option you will click.
Many video production software packages do something similar as this but if the one you are using doesn’t you can always use this as an option. This is what it would look like in the end video: