If you need to scroll an application window on a PC then spinning the mouse wheel is probably the simplest route. This only works on the foreground window, though, the one where you’re currently working. And so if you want to scroll some other window, you must click it first.
AlwaysMouseWheel is a tiny portable tool which changes all this. Once running, you can switch to and scroll any window Ubuntu-style just by moving the mouse cursor over it, and spinning the wheel – no extra click required. It’s a small improvement, but if you regularly work with a lot of open applications then it can make a real difference.