Middle mouse down behavior is great

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I use a trackball daily and was pleasantly surprised when I used middle mouse button (having never done so before despite using E search for years??? don't know how I missed this). Middle mouse button enables "scoll mode." The behavior is what I always dreamed of because scrolling with a trackball is endless and conveniently easy. Spin the ball and the page scrolls.

If you could tell me how this is implemented I would appreciate it very much as I would like to see if an autohotkey script could be made to do the same.

For those curious, middle mouse activates a "mode" in which the cursor is fixed in place yet moving the mouse along X or Y axis is converted to scroll messages. It's a 1:1 move-mouse-scroll. unlike in web browsers where middle mouse scroll mode is treated as a "velocity" determined by "mouse distance from start point" .

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Take a look at voidMouse

(it even includes source code)

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Dang, that made my day. Thanks so much.