To create a portal URL, you must create a portal list in the build interface, and set its external flag to true. (It doesn’t matter which world you build the list in, or whether it’s publicly accessible.) Add portals to the list in the usual way. Each portal will display a URL which you may copy and use.
The portal’s instance acts in the usual way -- you may create a URL that links to the global instance, or the player’s personal instance, or *your* personal instance. However, portal URLs may *not* use the “player’s current” instance option. (The player is entering the game from the outside, so there is no current instance!)
The portal URL will remain valid as long as the portal remains in the list, and the list is marked external: true. If you change external to false, the URL will stop working temporarily. If you delete the portal from the list, the URL will stop working *forever*. (Adding the world back to the portlist will generate a new URL.)
If you change the world (or instance) of the portal, the URL will remain valid, but will silently change to refer to the new world (instance).
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