As much as Microsoft has been willing to show of HoloLens, it has been surprisingly shy on some basic details. What devices work with the augmented reality headset? How long can you use it? How immersive will it really be? Thankfully, you just got answers to a few of those questions through a Microsoft evangelist's presentation at an Israeli event. To start, he notes that any Bluetooth- or WiFi-based device can talk to it, and it'll run any universal Windows 10 app. And yes, you can link multiple headsets for a shared experience, even over the internet.