Gateway

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A gateway system is one in which the inner world is perceived as a real place somewhere, or a (usually) large system with members predominantly from, often coming or going as they please.

History
The concept was introduced as early as 2001 by the Shire on their personal site and on the Dark Personalities mailing list.

Related Terms
A walk-in refers to a headmate who comes from elsewhere in the inner world.

In the context of a gateway system, a gatekeeper is one with the role of allowing or denying access to walk-ins.