Allow world creators to store, modify & check some variables on players local machine, similar to Javascript cookies. The variables would have a string access key (Dictionary datastructure, eg 'first_visit' = 'false').

Ideally players should also have an option to clear all cookies or the ones associated with a specific world.

Example use cases;

* Show "welcome back" message when player visits the world again.

* A world that consists of a maze with a social space at it's end. When a player reaches the end for the first time the cookie 'completed_maze' is set to 'true' and is stored in their cookie data file when they leave world. Then the next time that player visits the world, it checks the value and if it is true then a shortcut teleporter is created enabling the player to skip to the end.