mb event system 4 Sections EventSystems Doc
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Def M1 || M2
Def == M1 ||decl M2
Def == & 1of(2of(2of(M1))) || 1of(2of(2of(M2)))
Def == & 1of(2of(2of(2of(M1)))) || 1of(2of(2of(2of(M2))))
Def == & 1of(2of(2of(2of(2of(M1))))) || 1of(2of(2of(2of(2of(M2)))))
Def == & 1of(2of(2of(2of(2of(2of(M1)))))) || 1of(2of(2of(2of(2of(2of(M2))))))
Def == & 1of(2of(2of(2of(2of(2of(2of(M1))))))) || 1of(2of(2of(2of(2of(2of(2of(
Def == & 1of(2of(2of(2of(2of(2of(2of(M1))))))) || 1of(M2)))))))
Def == & 1of(2of(2of(2of(2of(2of(2of(2of(
Def == & 1of(M1)))))))) || 1of(2of(2of(2of(2of(2of(2of(2of(M2))))))))

is mentioned by

Def A ||+ B == A || B & ma-frame-compatible(AB) & ma-sframe-compatible(AB)[ma-compat]

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mb event system 4 Sections EventSystems Doc