Scrolling control under mouse cursor

[Martin]

I'm looking for a way to smoothly scroll the control under the mouse cursor
(not necessarily part of my application). I'm using C# with WindowFromPoint
to get the handle, and I've tried SetScrollPos and ScrollWindowEx without any
success. I'm simulating mouse wheel events right now, but this only scrolls
the active window and doesn't allow horizontal scrolling except in Vista.
Also, it doesn't allow precise scrolling at the pixel level (as far as I can
tell).

Any suggestions? Thanks!