How do you make a video of what shows up on screen(making a video of a tutorial using laptop)?

i want to know how people made videos of tutorials of like

how to change theme of comp...

you know,the whole screen comes up and you can see there

mouse and the home screen....

How do u make them types of videos?

NEED TO KNOW....i want to make one :DHow do you make a video of what shows up on screen(making a video of a tutorial using laptop)?
CamStudio is the best free version I know of.

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