This provides more flexibility - for example, applications programs can output files with formatting commands to look different in different circumstances. The word processor must describe the page precisely. The most popular page description language is Postscript . Most laser printers today use Postscript. Thus they can print any document produced by any word processor which uses postscript.
Older printers use the computer itself to drive the printer.
Thus the word processor must know exactly which printer it is writing to. Graphics Software Presentation graphics software is designed to create slides for talks. Slides integrate text and graphics differently from conventional papers. Color is not a problem for photographic slides the way it is for paper documents.