MonitorControl is an Open Source app that allows your monitors to be put to sleep via HTTP.
MonitorControl can also be used to turn monitors back on most systems. You can configure MonitorControl as you desire and use the web interface to control your computer monitors remotely. Any changes made will take effect immediately. One thing to note, closing the configuration window will not exit the program unless you click "Exit Program" or choose the "Exit" option from the tray icon's context menu.
MonitorControl works by creating a web server. This server can control the target monitors; you can even operate from other PCs if needed. For security, MonitorControl includes a whitelist where you can indicate the IP addresses that will have device access.
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