How to video computer without flicker

How do you create a video of your computer screen without seeing the flicker?

Can you clarify this for me ?
I have always been led to believe (possibly incorrectly) that LCD TVs and monitors could be videoed with no problems from flicker or moving "bars".
About five years ago a member of our video club was giving a talk on Photoshop and illustrated it with video shots of her computer monitor.
She isn't technically minded and simply pointed the camera (on a stand) at the screen.
The results appeared perfectly OK.
I haven't had the opportunity to test this as mine is a CRT, but was looking forward to being able to do it when I eventually get an iMac !
Am I going to be disappointed ?

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