This is called expose and spaces…

It’s located in your System Preferences

This Video is kinda confusing, because he is using short cut

Expose is active screen corners.. so you can assign what each corner functions..

MY setting are:

Left top: all windows

Right top: application window

Left bottom: sleep screen

Right bottom: dekstop

After applying.. Try to move the mouse to each corners.. and Look What You Have!

Fast scrolling HOHO!

after using it for a WHOLE DAY

then, YOu will say

“I CAn’t Live Without IT”