All Project Managers need to have the ability to share information. Screencasting is a technique for recording what is happening on the system while the system is being used. The top tool and my personal favorite is Camstudio Here is a demo of this free tool.
I was going to do a demo of the Microsoft screencasting utility Expression Encoder 4 but it was having a hard time keeping the audio so I would not recommend it at this time.
You can find a good comparison of all screencasting software here