When the player moves through the area covered by this entity, the game will be autosaved.
Name (targetname) - Property used to identify entities.
Master (master) - The name of a multisource (or game_team_master) entity. A master must usually be active in order for the entity to work. Thus they act almost like an on/off switch, in their simplest form, and like an AND gate in the case of the multisource.
This trigger only works once: it is removed when the auto-save occurs.