Internet services are, by their very nature, scriptable components that can be combined in novel ways. This part shows how to build custom groupware solutions—a collaborative document-review system, a helpdesk, a group calendar, a subscriber-oriented docbase notification system—based on HTTP, NNTP, SMTP, and LDAP services. Discussion plays a key role in several of these solutions, and the part concludes with a tutorial on setting up and using NNTP discussion servers.