In principle, you can record the output of any Windows program and save it as MP4.
Examples of possible recordings:
- You play a video in your browser that cannot be downloaded e.g. because it's encrypted.
- Record how you beat the final opponent in your favorite game.
- Play the content from a DVD and record the film.
- Record a video chat or phone call with Skype.
- Record video for your parents showing you how to use a particular program.