What declarations are used for separators?

When you create a type library in Delphi and create an interface and its associated CoClass, Delphi also creates the appropriate declaration declarations.

I understand that this is due to the fact that my interface is related to IDispatch, but I thought that TAutoObject implements everything necessary for IDispatch. So my question is thrice:

  • What is the separator used for?
  • Why is this needed?
  • How to use it?
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