How do you film just the computer screen?

Question

you know how some videos on youtube are like...just filming the screen?

you know...

like for example:

http://youtube.com/watch?v=wH6-twlgJhU

lol, well, you know how donny just like...filmed the screen of his computer?

how do you do that?

thanks for your helpful answers ^____^

Answer 1

all i know that that was friggin funny

Answer 2

They use programs that record their screens

http://camstudio.org/

is a free one