[mklim]

It's an extremely complicated peripheral, but it's still a peripheral. It's a monitor with an intricate tracking system that allows it to tell the PC powering it its exact location and orientation within a limited area. Playing a VR game is nothing like playing a game on a 3D monitor, it feels like you've been transported to another dimension, but the hardware itself isn't doing anything to execute the game and is still "just" a peripheral like a keyboard, monitor, or gamepad. It's just being fed what it should display by the PC and feeding the PC back information about its location and orientation. That's why Oculus initially needed to put a hardware check into their DRM to block shims like this, there's no real technical reason you can't use one in place of the other once you translate its I/O.