proxyEvaluator: The Evaluator Function Object Referred to from a Proxy Objec
In XR: A Structure for Interfaces from R

Any proxy for a server language object contains a reference to the interface evaluator object used to create the proxy object. This function retrieves the evaluator (whether or not there is a proxy class for this object). The function is called from specialized methods for particular server langauge classes, as part of a package using the XR package. End users will not typically need to call it directly; it is exported to simplify life for the extending package.