Normally all players share the same default spawn point that is close to {0, 0, 0} or a server defined point.
This mod changes it so that each player gets their own, random, spawn point.
When a player registers they get random X and Y coordinates between 1,000 and 30,000, each of these has a 50% chance to be negative.
This spawn point is stored in the players meta data and they will spawn here unless they have registered another spawn point.
If you enable this feature on an existing world the existing registered player's will not be affected. New players will be affected.
If you disable this feature on an existing world then spawning will revert to the games normal spawn behavior.
If enabled players can spawn in a house, the building will depend on the game being played or admin provided schematics.