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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
How to free more space on your home drive by redirecting the location for SDKs in RAD Studio