What are area objects?

[CactusCole]

When you use the function GetArea() what type of object does it return? An area object, a trigger, a placeable? I know it has an OnUserDefined event because they used SignalEvent(GetArea(OBJECT_SELF), EventOnUserDefined(20)); Where would I find these area objects because they don't exist in the blueprints?

[JCarter426]

It returns the module itself, the ones in the RIM and MOD files.

[CactusCole]

Found it it's the .are file, didn't notice the OnEnter and OnUserDefined scripts before