The statusRequest ATL COM module is capable of
querying the status of a reference object
Object reference...

The following paragraph defines the concept of object reference. This concept is of high importance within the statusRequest COM module and its generated XML infosets.

object reference

An object reference is an identification of an individual XML request defined by a unique triple of data, namely
  • timestamp (UNIX time) defined at the moment of generation
  • date of the object defined by the provider
  • id of the object defined by the provider
Each and every XML request of version 4.3 is defined by such an object reference. All XML responses are replies to the object reference of the corresponding request.

Thus the object reference is a clustered primary key of the request/response system!