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MAC OS X Apple advertises the Services menu in connection with other features of its operating system. For example, it's possible to Desktop Search for a piece of text by selecting it with the mouse and using the service from Spotlight . Other central services are Grab for taking screenshots, and the system Spell Checker . EMULATION From the point of view of software, the Services menu is a means of Inter-process Communication . To the user, it is an interface for executing actions on selected data. The emulation of the Services menu is based on the fact that there are several ways this can achieved in an operating system. Even in Mac OS X, there is an alternative system called the Context Menu handler. In the X Window System , any data selected in an application is available to all other programs. Thus the Services menu can be an application which retrieves the current selection, and lets the user choose an action. Missing is the part about returning the processed data back to the originating application. Instead, the service can open a new window to show the results. REFERENCES
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