The latest Insider build of Windows 10 (Build 15048 for the curious) appeared at first to be a simple bugfix release. But hidden inside was a neat little gem for Mixed Reality developers: Support for the technology complete with a demo.

For most of us, this means little. Attempting to run the demo without a pricey Mixed Reality developers kit will only unlock a simulation of the demo, not an actual Mixed Reality experience. You will also need to enable "Developers Mode" on Windows 10's settings panel to enable the "Mixed Reality Portal" that leads to the demo in the first place.If you've done all that developer mode prerequisite black magic, and are running the right build (15048) you should find the "Windows Mixed Reality" app in the start menu. Inside, you can test whether your PC is ready for Mixed Reality (probably the most interesting feature to the average user at this point), run the simulation, or if you are in possession of the proper hardware, actually run the demo in actual Mixed Reality.

The "Windows Mixed Reality" portal app seems to completely replace any reference to the older Microsoft "HoloLens" technology.