PDF (Computer file format)

found: Work cat.: Alspach, T. PDF with Acrobat 4, c1999:p. 7 Mini Glossary (PDF: Portable Document Format. The file format used by Acrobat software. PDF files are exactly the same on Windows, Macintosh, and UNIX platforms.)

found: PDF Zone website("PDF is a unique type of cross platform file format developed by Adobe ... PDF files have many of the same characteristics as HTML documents ... A combination of HTML and PDF format enables the publisher to serve content to their users in its most useful format based on the demands of content versus technology.")