Clients are able to retrieve documents using keywords.
The client can retrieve text or multimedia documents stored on the server . Programmatically, widgets are often expressed as data structures. The style of user interface invented at Xerox PARC, popularized by the Apple Macintosh, and now available in other graphical user interfaces , such as the X Window System , Motif, MicroSoft Windows, etc. Also used as a derogatory term for those users who prefer such interfaces by those who do not. In astronomy, a term used to describe a spectral range within which the Earth's atmosphere is relatively transparent to radiation, as in radio window , optical window .