Let's say if we enter a city from screen A1, we enter Aa, and exit back to A1. If there are multiple entrances on A1, each may go to a different part of Aa. One would be the return spot if someone walks out of the city. For that, it needs a zlocation.
If we are talking about making teleports, so A1 can have an entrance to Bb, we also need a screen, like an invisible teleport around the edge. We could color the edge borders to look like a wall or green grass, etc., to use more area, and teleport when someone moves out of the edge. If we want to go further, each edge could have its own teleport.
Or, forget making it exit at the edge, and have an invisible item that teleports automatically? Hmmm... Maybe that's too far. We'd need 2*(h+w-2) items for a screen with no walls.
-QuaCzar : SysOp | P2P Guide | Anarchy Leader | #1 Magic