meaning of context free

1. context-free Said of a grammar where the syntax of each constituent is independent of the symbols occuring before and after it in a sentence. Parsers for such grammars are simpler than those for context-dependent grammars because the parser need only know the current symbol. context-sensitive menu system> A menu which appears in response to a user action typically a mouse click and whose contents are determined by which application window was clicked or has the input focus. Most GUIs use a secondary mouse button right or middle to call up a context-sensitive menu as the primary mouse button is normally used to interact with objects which are already visible. The context-sensitive menu often contains functions that are also available in a menu bar but the context-sensitive menu provides quick access to a subset of functions that are particularly relevant to the window area clicked on. The RISC OS WIMP uses only context-sensitive menus always invoked using the middle mouse button. This saves screen space and reduces mouse movement compared to a menu bar.

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