Dexterity-based applications support two types of libraries: COM type libraries and resource libraries.
A COM type library is a special type of file that uses a standard format to describe the interfaces, classes, methods, properties, and events an application makes available through COM. Most applications that implement COM will provide a type library that describes the implementation. A Dexterity-based application can have references to COM type libraries so that code can be written to access the functionality the COM interface is providing. Refer to COM Libraries for details about using COM type libraries.
Resource libraries contain applications resources, such as icons, that can be used within a Dexterity-based application. To use the resources in the resource library, you first create a reference to it. Then you create references to the specific resources within resource library.