NeWS Facilities for an Interactive World

The previous chapter described the PostScript language as defined by Adobe Systems, originally designed to drive printers. With printers, only one PostScript program is being executed at a time and output can only take place to a single page at a time. In contrast, NeWS is a window system. It requires that multiple application programs be able to concurrently access the display, which is partitioned into separate regions for each application. And it needs to handle input from a keyboard, a mouse, and the network.