It is a native windowing system, probably a port from Haiku.
replyThere exists at least one rootless X11 server for BeOS/Haiku that would run on top, that shouldn't be too difficult to port (knock on wood ...)
It runs haiku apps through a compatibility layer
replyit's a little bit more of a compatible layer, it's just a native implementation really. You wouldn't call android a "compatibility layer" right? Kind of a similar idea here.
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