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*''programming language support'': DPS introduced the concept of a "pswrap", which allowed developers to wrap PostScript code into a C language function which could then be called from an application.
DPS did not, however, add a windowing system. That was left to the implementation to provide, and DPS was meant to be used in conjunction with an existing windowing engine. This was often the [[X Window System]], and in this form Display PostScript was later adopted by companies such as [[International Business Machines|IBM]] and [[SGI]] for their workstations.
On the NeXT system a completely new windowing engine was written, to take full advantage of their [[object oriented]] [[operating system]]. The windowing system itself used PostScript to draw items like titlebars and scrollers. This, in turn, made extensive use of pswraps, which were in turn wrapped in objects and presented to the programmer in object form.
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