Apple's Bonjour service in OS X is a convenient zero-configuration autodiscovery technology that allows the operating system to locate and present various network services available to you. For example, if a computer on the network has file sharing available, then the system will discover that and make it available in relevant areas of the system such as the Finder, and also allow your system to easily discover shared printers, remote log-in capability, screen sharing, and similar services the remote computer may have enabled.
While convenient, most of the services that Bonjour broadcasts are contextual, meaning that they only appear on your computer in the relevant programs and features that support them. For instance, if a system on your network has remote log-in enabled then you can detect the remote log-in broadcast by opening the Terminal utility and choosing its New Remote Connection option, but otherwise you wouldn't be aware that this broadcast is available.
The Terminal can be used to look up specific Bonjour services.
(Credit: Screenshot by Topher Kessler/CNET )
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