Def Msg(M) == l:IdLnkt:IdM(l,t)

is mentioned by

Thm* the_w:World, i:Id, t:. Thm* m(i;t)  {m:Msg(the_w.M)| source(mlnk(m)) = i } List	[w-m_wf]
Def Msg == Msg(w.M)	[w-Msg]
Def World Def == T:IdIdType Def == TA:IdIdType Def == M:IdLnkIdType Def == (i:Id(x:IdT(i,x)))(i:Idaction(w-action-dec(TA;M;i))) Def == (i:Id({m:Msg(M)| source(mlnk(m)) = i } List))Top	[world]

In prior sections: mb event system 1 mb event system 2

Try larger context: EventSystems IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html