The server software uses an Adobe PostScript interpreter, known as CPSI (Configurable PostScript Interpreter). PostScript files come in three levels. Each level of PostScript represents a development in the programming language and the addition of new features. PostScript level 3 is the latest level. To Utilize PostScript 3 to its full potential you must have an application, a PostScript printer driver and a PPD file that all support PostScript level 3.