SOAP - Protocol
Simple Object Access Protocol provides a way for applications to communicate with each other over the Internet, independent of platform. Unlike DCOM's IIOP, SOAP piggybacks a DOM onto HTTP (port 80) in order to penetrate server firewalls, which are usually configured to accept port 80 and port 21 (FTP ) requests. SOAP relies on XML to define the format of the information and then adds the necessary HTTP headers to send it. SOAP was developed by Microsoft, DevelopMentor, and Userland Software and has been proposed to the Internet Engineering Task Force (IETF ) as a standard.