<ArbitraryID>
<Arbitrary.ID>

<ArbitraryID>.on_signal( Function() )
<ArbitraryID>.on_signal( Function(Variant) )

<ArbitraryID>.signal()
<ArbitraryID>.signal( arg:Variant )

The use of a unique <GlobalID> defines a category with the same name within the automatically generated GlobalID enum. Enum categories are integers underneath, so this makes it ideal for small "ad-hoc" state definitions and call arguments where creating a dedicated enum might prove cumbersome.