Window

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A window is a way to view what is going on outside of the headspace or with the current fronter(s), without having to be in or near the fronting room.

It appears like a window, an opening of some sort, or even as some sort of screen.

Related Terms
This is usually used by protectors/protective headmates or by headmates that manage the system or know a lot about the system (gatekeepers, managers, overseers, internal self helpers, archivist, etc.).