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TCLSID, TIID translates to System.Guid
Interfaces descending from IUnknown translates to an attribute with Guid, specifying the COM ID as a string parameter without the parenthesis, and an attribute of InterfaceType with parameter of ComInterfaceType.InterfaceIsIUnknown
This article discusses the new Delphi 8 property access specifiers.
Continued discussion of undocumented Delphi 8 Property Access Specifiers, and other ways of adding and removing delegates / events handlers, including clearing the list of all the delegates / event handlers.