The ResolveReference method determines which photoset or photoset group the provided reference is pointing to. This method is new in API 1.6.
ResolveResult ResolveReference( string loginName, string reference )
Resolution result in the form of a ResolveResult structure.
A reference is a string the user can associate with a photoset or photoset group that becomes a part of the photoset or group URL. It is also used as client access code.