http://www.rfc-editor.org/rfc/rfc0992.txt
RFC 0992: On communication support for fault tolerant process groups, K.P. Birman, T.A. Joseph1986-11-01T23:00:00-00:00This memo describes a collection of multicast communication primitives integrated with a mechanism for handling process failure and recovery. These primitives facilitate the implementation of fault-tolerant process groups, which can be used to provide distributed services in an environment subject to non-malicious crash failures.