mb event system 7 Sections EventSystems Doc
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Def true == inl()

is mentioned by

Def once(loc;a;i)
Def == if loc = i
Def == if [ma-single-pre-init1("done";;false;a;Unit;x,v.x); 
Def == if [only members of [locl(a)] affect "done" :
Def == if [ma-single-effect0("done";;locl(a);Unit;x,v. true)]
Def == else nil fi
[once]

In prior sections: bool 1 sqequal 1 mb list 2 mb event system 2 mb event system 6 list 1 union mb basic mb event system 3

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

mb event system 7 Sections EventSystems Doc