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    <p>Every object has an internal property known as <code>[[Prototype]]</code> that carries a reference to another object, known as its prototype. When the JS interpreter is unable to find a named property in the object's own members, it looks for them in the object's prototype, then the prototype's prototype, and so on until it reaches <code>Object.prototype</code>, the lowest prototype of every object, which has no <code>[[Prototype]]</code> itself.</p> <p>The <code>[[Prototype]]</code> property is assigned the value of the constructor-function's <code>prototype</code> property by the <code>new</code> operator. So when you call <code>new Person</code> the new object receives <code>[[Prototype]]= Person.prototype</code>. When you create a function, it gets a new, empty object for its <code>prototype</code> property, but you can reassign the constructor-function's <code>.prototype</code> completely as well as writing new members to it.</p> <p>However the <code>[[Prototype]]</code> property remains the same through the life of the object; in particular, whilst adding new members to the <code>Person.prototype</code> makes them visible in all <code>Person</code> instances, assigning a new object to <code>Person.prototype</code> does not change the prototypes of existing <code>Person</code> instances.</p> <p>Normally, <code>[[Prototype]]</code> is an invisible implementation detail. But in Mozilla, the <code>[[Prototype]]</code> internal property is exposed under the public <code>__proto__</code> property. This non-standard extension has been adopted by Opera, Safari and Chrome, but not IE. In general it is considered poor form to rely on.</p> <p>In ECMAScript Fifth Edition, you will be able to fetch the <code>[[Prototype]]</code> value using the new function <code>Object.getPrototypeOf(person)</code>. Browser support is poor so far.</p>
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    1. CO...few doubts. 1) Did you mean that pObj = new Person('top') adds a property called "Prototype" in pObj which is a reference to Person.Prototype? 2) Is there any way in which I can interact with _proto_. May be by augmenting it further?...or its read only!!
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    2. CO`pObj= new Person('top')` creates a new object and sets its internal `[[Prototype]]` property to the object referred to the visible `Person.prototype` property. You can't see the `[[Prototype]]` property except as noted above in browser-specific ways, but you can still interact with `Person.prototype`, adding new methods there which will then appear on `pObj`.
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