is mentioned by

Def p = q == 1of(p) = 1of(q)(2of(p)=2of(q))	[w-eq-E]
Def w-tagged(tg; mss) == filter(ms.mtag(ms) = tg;mss)	[w-tagged]
Def w-action-dec(TA;M;i)(k) Def == kindcase(k;a.TA(i,a);l,tg.if destination(l) = i M(l,tg) else Void fi)	[w-action-dec]
Def sends(l,tg,e) == filter(m.mtag(m) = tg;sends(l;e))	[es-tg-sends]

In prior sections: mb event system 2

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