>One of my favorite features that has come to Windows 10 is the ability to scroll an inactive window. Prior to Windows 10, and assuming you were not running a third party utility which enabled this, in order to scroll a window you had to first select it.
The author might be referring to KatMouse[0] here. It a fantastic little program, always one of my first installs when I roll out a new system.
Another option is: Windows has had built-in support for focus-follows-mouse since at least Windows 2000. (Enabling it means that keyboard input also goes to the window under the cursor, natch. But I prefer that: I find it dramatically reduces the amount of clicking I do.)
The author might be referring to KatMouse[0] here. It a fantastic little program, always one of my first installs when I roll out a new system.
[0] http://ehiti.de/katmouse/