The Remote Desktop Device Redirector Bus is a Windows system driver that facilitates the redirection of devices (such as printers, drives, and other peripherals) from a local machine to a remote desktop session. When you connect to a Windows machine through Remote Desktop (RDP), this driver allows certain devices on your local system (such as USB devices or local printers) to be accessed and used in the remote session.
The "Remote Desktop Device Redirector Bus" is part of the Remote Desktop Services infrastructure and is specifically responsible for handling the communication between the local machine and the remote session. It ensures that devices such as USB drives, printers, and audio devices on your local machine are redirected and available to the remote session.