Training how to operate the border, in program WorldBuilder
The video is in Russian, but I have translated for you the list of things that will be discussed there.
00: 00 introduction and common mistakes
01: 23 retainer and its purpose
03:55 Border Tool (the new frontier)
05: 30 how to link timer scripts for border switching with a condition
08: 15 how to specify your location where the camera will be pointed for the player (starting point)
11: 05 how the map is expanded by timer (view from the game)