UPDATE: I made a video explaining this in December 2016. The article can still be read after the video, if you prefer.
If you use Windows, chances are, you know about the Task Manager.
Windows Task Manager is a task manager application included with Microsoft Windows NT family of operating systems that provides detailed information about computer performance and running applications, processes and CPU usage, commit charge and memory information, network activity and statistics, logged-in users, and system services. The Task Manager can also be used to set process priorities, processor affinity, forcibly terminate processes, and shut down, restart, hibernate or log off from Windows.
Typically accessed via CTRL+ALT+DEL, this handy tool was never intended to be widely used. Watch below for a laugh as engineer David Bradley takes a friendly jab at Bill Gates, regarding the feature:
I use it very often, mainly to kill processes, change priorities, and monitor system performance. That’s why, a few years ago, I was surprised to find a somewhat hidden feature in there. Simply double-click anywhere in the main Task Management window, and it will switch over to Tiny Footprint mode. The menu bar and tab bar disappear, and the contents are maximized.
Apparently, some people were accidentally activating this mode, and didn’t know how to change it back. To help those people, Microsoft added a knowledge base article. All you have to do to is double-click the window contents once more.