This article looks at the tools for monitoring Domino's statistics and events and how they help administrators keep track of server conditions by issuing notices and alerts -- for example, whenever a server is running low on disk space.
NotesCONNECT (a Notes application downloadable from the Sandbox) troubleshoots Notes TCP/IP connection problems by using Notes API calls (but not the Public Address Book or Notes address resolution logic) to make TCP/IP connections.