The Application Exchange (APEX) Option Party Pack, Part Deux!
E. Dixon, Hardy R. Franklin, J. Kint, Graham Klyne, David New, S. Pead, M. Rose, M. Schwartz · 2002
Application Exchange (APEX), at its core, provides a best-effort application-layer datagram service. Options are used to alter the semantics of the core service. This memo defines various options to change the default behavior of APEX's relaying mesh.