The need for process migration was identified in the late 1970's by Solomon and
Finkel [#SolomonTRDOS##1#] but only relatively few successful implementations
have been reported. Amongst them are the Eden system [#LazowskaTAOTE##1#], its
successor the Emerald system [#JulFGMIT##1#], Accent [#RashidAACON##1#],
Demos/MP [#PowellPMIDM##1#], LOCUS [#WalkerTLDOS##1#], the V-system
[#TheimerPREFF##1#], Charlotte [#ArtsyDAPMF##1#], Sprite
[#DouglisPMITS##1#,#DouglisTPMDA##1#], SPICE [#ZayasATPMB##1#], and Chorus/COOL
[#HabertCKSFO##1#]. A selection of these mechanisms will be examined in more
detail in section #existnonu#2530>.
Various attempts have been made to migrate UNIX processes. These deserve some
attention and will be addressed in more detail in section #umig#2531>, largely
because they demonstrate the difficulties inherent in such an approach.