There are many ways to lock down security in Windows, including through a
wide selection of third party apps. You can even use the Win + L keys
to lock the current session and keep unauthorized users out.
Unfortunately, that locks the entire session but what if you only wanted
to lock various active windows. For example, while providing someone
remote access to your computer, what if you wanted to lock-down just
your current web browsing session?
WinLock is a convenient tool that allows you to specifically hide and password lock and focused or active window.