By default REM4P has bindings for the Dualshock 4, xInput controller and keyboard/mouse.

Controllers

In order to use the Dualshock 4 or xInput controller with Remote Play simply click the Remote Play window to bring it into focus, any controller mappings will then be enabled. If the Remote Play window loses focus input will reset and be disabled until focus is regained.

Keyboard & Mouse

In order to use Keyboard and Mouse input you have to ‘capture input’, this means you need to use the capture hotkey to grab and ungrab keyboard and mouse input.

By default the capture toggle hotkey is assigned to ALT + C. 

The capture hotkey can be changed under the REM4P settings window referenced in the previous section.