Direct mode
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Direct mode is a mode of VR display for windows based PCs running Nvidia graphics card drivers where the graphics driver bypasses the window server.
In Direct Mode, the display driver treats the HMD as an entity separate from the windowing system and accessible only to VR apps. It improves plug-and-play capabilities and prevents numerous UX issues that occur when the OS treats the HMD as just another monitor. It also allows HMD developers to reduce latency by giving them the control over frame queuing and vsync behavior.[1]
Direct mode is supported by GameWorks VR by Nvidia.
SteamVR introduced Direct Mode February 11, 2016.