It appears this feature is new to Windows 10 (at least, it’s not available in Windows 7). It will probably only be useful to a narrow niche of user, but if you like to dig your virtual fingers into the innards of Windows Via the command prompt, Windows 10 provides a ghostly way to interface with it.
To access the Command Prompt interface in Windows 10, click on the Windows menu and type “Command Prompt” to bring up quick access to its desktop app. Click that. To personalize the experience, right-click at the topof the window to prompt a pop-up menu and choose “Properties.” Click over to the “Colors” tab to see a range of personalization options. At the bottom of this tab, you’ll find the “Opacity” slider, which allows you to see through the Command Prompt window.