This one, originally used for the peripherals of exit of the printing type, is used here for the peripherals of the screen type.
The system Display PostScript is based on an architecture client/server. Posting is managed by a PostScript interpreter, generating on the screen a chart of the orders provided by the applications. These last are connected with the waiter of posting by the means of one specialized library, which contains a application program interface providing similar services to a traditional graphic system in addition to the functions necessary to connection.
This system can constitute the graphic system “native” in a Operating system (such as for example in NeXT) or be carried out above a graphic system of fenestration.
The original implementation on Next machine was present in the NextStep system. It then was the subject of the definition of a standard: OpenStep, which gave place to different implementation: owner on the computers using Windows, free on machines using UNIX: GNUstep.
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