MagicMonitorDuplicator for Windows

The description of MagicMonitorDuplicator - Play With New Friends

A tool for mirroring the full screen on any two or more multi-monitor environments. The feature is that you do not need to change the resolution, aspect ratio (size / pixel), and aspect resolution settings of each monitor. The entire monitor specified as the transfer source can be mirrored to fit the screen of the transfer destination. I hope that you can easily enjoy your favorite video etc on the full screen of the two monitors.