What Is An Application Server?
More commonly used in businesses, application server software provides shared services to other applications on client/server networks.
Apache Web Server
Apache consistently rates as the world's most popular Web server. It is full-featured, reliable, and free.
Introduction to Client Server Networking
Web sites use the client server model of computer networking where browsers (the clients) interact with Web servers.
XML-RPC is a network programming technique for making procedure calls to software running on remote devices. XML-RPC technology is sometimes used by Web services.