Each interface can be an API (application program interface), standard protocol (e.g., HTTP), config files, input data file format, or interactive user interface (e.g., command-line or GUI). One component may have multiple interfaces: e.g., a server may handle requests in a standard protocol, but also have a config file, command-line options, an administrative control panel GUI, and a performance monitoring API.

TIP: Use an HTML anchor for each component so that a direct link can be made from other documents, issues, and email messages.