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Where you see what is happening in Smode. You can do without it but what would be the point ?There is 2 different viewport, 2D and 3D, with different behaviors each. Also 3D viewport will not take 2D effects in account so is faster.
Double click on the 3D viewport to go in 4 view mode:
The mouse cross can be activated on Processor to have a better view of the mouse position when doing video mapping.