So now onto Proxy. A proxy is different as it is an object that actually points to another object. When references are assigned to a proxy, they are assigned to the proxy not the target object. If the object behind the proxy changes, the existing reference points to the new value. Normally, older references remain glued to the older value as follows:

//create a new array
A = [1,2,3]

//create a reference to A
B = A

//create a new array
A = [20,30,40]

trace(B[0]) //1
trace(A[0]) //20

When A was overwritten with a new value, the B reference maintained the link to memory originally allocated to A.

Let use a Proxy:

http://www.powersdk.com/sample/proxy.zip


//create a Proxy with a value of [1,2,3]
A = new Proxy( [1,2,3] )

//create a reference to the Proxy
B = A

//trace the value through the proxy references
trace(A[0]) //1
trace(B[0]) //1

// change the Proxy value
Proxy.setValue( A , {name:23} )

//trace the value through the proxy references
trace( A['name'] ) //23
trace( B['name'] ) //23

//obtain the true Proxy value
myProxyValue = Proxy.getValue( A )