A simple, yet very useful utility for full screen games on dual monitor. Some games that don't I/O block interacting with the other monitor in full screen can be rather annoying as you can accidentally click off the game.
Simply edit the window name in wnd_target.txt and start the executable. While it runs it forces your mouse to stay within the boundaries of the target window while it's focused.
If you would like to start the software automatically when you launch a game through Steam, you can edit the launch arguments to be as follows
path/to/start.ps1 %COMMAND% -your_optional_game_arguments=0
and then edit the start.ps1 to use the proper game executable.