(also a transparent screensaver)

It's a screensaver with 1% opacity. Unlike most screensavers, it doesn't end on mouse movement, just on clicks or keyboard presses. And the last thing it does before it exists is call LockWorkStation() so if someone tries to use your computer, they'll be presented with the Windows lockscreen. None of your co-workers will be pranking you now!

Currently a derivative of Write a Screensaver that Actually Works, however I am slowly ripping out the guts to simplify it.

There is a compiled version available.

It's a personal project. Feel free to download the source & compile it, or use it as a base for a new screensaver project. I am not actively working on this project now that I telecommute and have no physically copresent coworkers trying to prank me.

Set up a trigger of some sort (say with AutoHotKey) to run "InvisibleLockScreen.scr /s".

Copy bin\Release\InvisbleLockScreen.scr to C:\Windows\SysWOW64. In Screen Saver Settings, pick "InvisibleLockScreen" as your screensaver. You can leave "On resume, display logon screen" unchecked.

There are programs out there (e.g. Pro Key Lock, Transparent Screen Lock) that can lock your computer's keyboard/mouse while still showing the running applications, which can be very useful. However they rely on hacky techniques like intercepting Win32 Messages and they charge money. Pro Key Lock, for instance, freaked out when I turned on Sticky Keys for my RSI and I had to forcefully reboot my computer.

After that, I felt there had to be a simpler way to do it that took advantage of Windows native lock screen abilities. So I made this in about 3 hours.