The proxy object is generated internally by PowerBuilder as a wrapping layer for the remote object. It defines the remote object's interface and instance variables and exists only on the client side to represent the remote object and redirects messages and calls to it.
"AutoInstantiate" option in the Custom Class User Object's popup menu
You specify the name of the proxy object for a user object in the User Object painter by selecting from the right-click menu option. The client application only requires access to an object's proxy object, not to the physical object itself.