https://arstechnica.com/gadgets/2018/06/new-hinge-api-gives-more-hints-about-microsofts-2-screen-andromeda-device/

We've seen from patent filings and leaked timelines that Microsoft seems to be working on a dual-screen handheld device codenamed Andromeda. Some new APIs found in the latest Windows 10 preview provide more evidence, even offering clues as to its capabilities.

Twitter user WalkingCat spotted an API for devices with two screens and a hinge. Applications can query the orientation of the two screens and the position of the hinge. The hinge's position is reported as being one of several options: closed, concave, convex, flat, and full.