Displaying % of screen

[CL10]

Dont really know how to explain this, I think it was on a mac. Anyway... computer connected up to projector and the user had the ability to only show parts of the screen they wanted. Think they could use shapes or something, for example: able to drag a square to the desired size and only show part of the screen the shape had been drawn within?
Anyone know anything about this? haha thanks

 

[///AMG]

Adobe projector?

 

[Moz168]

Are you actually trying to do it or you just interested to know about it?
I know when I have my laptop connect to the tv, if I go into the display setting I then have the option to mirror the image, split it or use it so two screen are next to each other and you can 'throw' things from one screen to the other.
Only gives me access to the options when its actually connected though.

 

[CL10]

Intrested really mate, could be handy for something later on.
Thanks for that mate but it was basically a mirror image but with the abilty to ""pull a blind" over what you didnt want to show.