Recording your screen
Screen recording can be useful when you need to record a how-to video to help someone learn how to use a program, record a game walkthrough, or prepare for a presentation. Record here means you can create a video of whatever you are doing on your desktop, save the recording as a video file and send it to a friend or upload it on YouTube.
Click http://lifehacker.com/5839047/five-best-screencasting-or-screen-recording-tools link to open resource.