Using the type library editor, you can create new type libraries or edit existing ones. Typically, an application developer uses a wizard to create the objects that are exposed in the type library, letting Delphi generate the type library automatically. Then, the automatically-generated type library is opened in the Type Library editor so that the interfaces can be defined (or modified), type definitions added, and so on. 

However, even if you are not using a wizard to define the objects, you can use the Type Library editor to define a new type library. In this case, you must create any implementation classes yourself, because the Type Library editor does not generate code for CoClasses that were not associated with a type library by a wizard. 

The editor supports a subset of valid types in a type library 

The following topics describe how to:

• Create a new type library
• Open an existing type library
• Add an interface to the type library
• Modify an interface
• Add properties and methods to the type library
• Add a CoClass to the type library
• Add an interface to a CoClass
• Add an enumeration to the type library
• Add an alias to the type library
• Add a record or union to the type library
• Add a module to the type library
• Save and register type library information