Windows 10 appears to have another new feature that I have never noticed on previous versions. If, for example, you have two windows open and one window is active, you can move the mouse over the second window and the wheel of the mouse will allow you to scroll the second window without actually clicking it and making it active. If I remember right, Unix has had this for a long time and there used to be a program that would do something similar in Windows, however, it was a bit different in that it would activate any window your mouse scrolled over....the Windows 10 mode is that it does not activate but allows scolling....quite handy in some applications.