Item 

Description 

CoClass Name  

Specify the class whose properties and methods you want to expose to client applications. This is the name of the CoClass. The implementation class has the same name with a T prepended.  

Instancing  

Specify an instancing mode to indicate how your COM object is launched. When your COM object is used only as an in-process server, instancing is ignored.  

Threading Model  

Choose the threading model to indicate how client applications can call your COM object’s interface. The threading model you choose determines how the object is registered. You must make sure that your object implementation adheres to the model selected.  

Implemented Interface  

Indicates the name of the COM object’s default interface. By default, the COM object’s interface is the same as the CoClass name, with an ‘I’ prepended. When you accept the default interface, your object gets a new interface that descends from IUnknown, which you can then define using the Type Library editor. You can change the default name of the interface by typing a name into the edit box.
Instead of implementing a new interface, you can choose to have your object implement any dual or custom interface that is in a type library registered on your system. To choose the interface to implement, click the List button, which displays the Interface Selection wizard. Note that this wizard takes a bit of time to load because it must locate all interfaces that are defined in type libraries registered on your system. Note that you must use the Interface Selection wizard to implement an existing interface. If you type in the name of an existing interface, the wizard does not recognize this as an existing interface and assumes you are simply providing the object with a different interface name.  

Description  

Enter a description of the COM object you are creating.  

Include Type Library  

Check this box to generate a type library for this object. A type library contains type information that allows you to expose any object interface and its methods and properties to client applications.  

Mark interface OleAutomation  

Check this box to allow type library marshaling. This flag lets you avoid writing your own proxy-stub DLL for custom marshaling.
When marking an interface as OleAutomation, you must ensure that it uses OLE Automation compatible types.