Some definitions of interest.
ma-compat	Def A ||+ B == A || B & ma-frame-compatible(A; B) & ma-sframe-compatible(A; B)
Id	Def Id == Atom
	Thm* Id  Type
once	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
	Thm* loc,a,i:Id. once(loc;a;i)  MsgA List
pairwise	Def (x,yL.P(x;y)) == i:||L||, j:i. P(L[j];L[i])
	Thm* T:Type{i}, L:T List, P:(TTProp{i'}). (x,yL.P(x,y))  Prop{i'}

About: IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html