Object - MACROMEDIA FLASH MX 2004-ACTIONSCRIPT LANGUAGE Reference

Object.__proto__
Availability
Flash Player 5.
Usage
myObject.__proto__
Description
Property; refers to the
The
__proto__
ActionScript interpreter uses the
the object's constructor function to find out what properties and methods the object inherits
from its class.
666 Chapter 2: ActionScript Language Reference
property of the constructor function that created
prototype
property is automatically assigned to all objects when they are created. The
__proto__
property to access the
myObject
property of
prototype
.