Application Programming Interface(A set of routines that an application uses to request and carry out lower-level services performed by a computer's operating system. These routines usually carry out maintenance tasks such as managing files and displaying information)
Toepassingsprogrammeringsinterface voor generieke beveiligingsservices(A generic API for performing client-server authentication that can be implemented over any authentication system. GSS-API makes it possible for applications to use the same API with different authentication mechanisms)
Message Application Programming Interface(A messaging architecture that enables multiple applications to interact with multiple messaging systems across a variety of hardware platforms. MAPI is built on the Component Object Model (COM) foundation)