i do and it still stops
What you have to understand is that it is the very tip of the pointer that is important, that is where you will click, and it is just the pixel at the tip that cannot be moved off the screen. When you move right, or down, the rest of the pointer may be off the screen, but try moving it down below the Start icon then click. You'll find that the active tip of the pointer has stopped at the bottom of the screen and can still click on Start, or any other icon on the taskbar.
It does, but not entirely. Egdes of the default "arrow" cursor can still be seen on the screen. The bottom edge leaves very little of the cursor visible, but it still sticks up a bit.
thats what i asked but was told no. i believe OP was referring to screen perimeters when using the term "window"
yes because the pixel of the mouse pointer is at the tip of the pointer arrow.
