Devices

Onlyview can interact with a number of hardware devices via plug-ins. These devices are accessible in the Content dock -> OBJECTS tab.

PJLink can turn videoprojectors on and off; MatrixSwitcher lets you control the patching of video switcher from timelines or any other place.

There is also built-in support for the Elgato StreamDeck - you don't need to create a device to use it.