(1) See Windows Workflow Foundation.
(2) (World Wide Fund) A file format created by the German World Wide Fund for Nature that cannot be printed. Using a .WWF file extension, it is a PDF file that can be read by most PDF readers with its printer configuration set to "non-printable." However, some PDF readers, such as Ghostscript, can print the file. The purpose of the WWF format is to make people aware of the enormous number of trees that are cut down every year to print paper that is sometimes used for one brief reading. See PDF.