The PDF-Format was created by Adobe. It is a postscript-based page description language, with support for hyperlinks, inline images etc. While PDF 1.0 is completely Ascii-based, PDF 1.1 also allows binary data in the file. Many programs nowadays come with their documentation in PDF files as well as printed manuals. These files can be read or printed using Adobe's Acrobat Reader.
Quick Info:
Name: Adobe Portable Document Format
Type: Text
Extension: PDF
Viewer Application: Acrobat Reader
Specification: Available via FTP:
PDFSPEC.PDF(This is a PDF file itself!)
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Alexander Krauss