[doublerebel]

For Hololens, the answer to all those questions is ‘yes’. The windows last forever — unless the room/space changes so much that the spatial mapping can no longer recognize it.

Microsoft calls this permanent layout feature ‘spatial anchors’, Google calls it ‘Geospatial anchors’, Apple calls it ‘Content Anchors’ aka ARAnchor.

Spatial mapping uses many sensors, it’s way beyond GPS. These APIs have existed since the beginning of WMR/ARCore/ARKit, 2016-2017.

[coder543]

Specifically for visionOS, WorldAnchors: https://developer.apple.com/documentation/arkit/worldanchor

And their locations will be remembered (by ID) if an app wants to offer persistent experiences at multiple locations. Not so sure about windows on visionOS.