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The Portable Document Format (PDF) is the file format created by Adobe Systems, in 1993, for document exchange. PDF is used for representing two dimensional documents in a device independent and display resolution independent fixed layout document format. Each PDF file encapsulates a complete description of a 2 D document (and, with Acrobat 3 D, embedded 3 D documents) that includes the text, fonts, images, and 2 D vector graphics that compose the document. From the Wikipedia entry for PDF:

A portable application (portable app) is a computer software program that is able to run independently without the need to install files to the system it is run upon. They are commonly used on a removable storage device such as a CD, USB flash drive, flash card, or floppy disk. Portable apps should not be confused with software portability where software allows its source code to be compiled for different computing platforms. Portable applications can be run on any computer system with which

The Portable Executable (PE) format is a file format for executables, object code, and DLLs, used in 32 bit and 64 bit versions of Windows operating systems. The term portable refers to the format's versatility in numerous environments of operating system software architecture. The PE format is a data structure that encapsulates the information necessary for the Windows OS loader to manage the wrapped executable code. This includes dynamic library references for linking, API export and import

The phrase Netpbm format commonly refers to any or all of the members of a set of closely related graphics formats used and defined by the Netpbm project. The portable pixmap format (PPM), the portable graymap format (PGM) and the portable bitmap format (PBM) are image file formats originally designed to be easily exchanged between platforms. They are also sometimes referred to collectively as the portable anymap format (PNM). The PBM format was invented by Jef Poskanzer in the 1980s as a

Portable Network Graphics (PNG) is a bitmapped image format that employs lossless data compression. PNG was created to improve upon and replace GIF (Graphics Interchange Format) as an image file format not requiring a patent license. It is pronounced /ˈpɪŋ/ ping, or pee en jee. The PNG acronym is optionally recursive, unofficially standing for PNG's Not GIF. PNG supports palette based (palettes of 24 bit RGB or 32 bit RGBA colors), greyscale, greyscale with alpha, RGB, or RGBA images. PNG was

The Macintosh Portable was Apple Computer's first attempt at making a battery powered portable Macintosh personal computer that held the power of a desktop Macintosh. Released on September 20, 1989, it was received with excitement from most critics but with very poor sales to consumers. Seemingly no expense was spared in the construction of the machine. It featured a black and white active matrix LCD screen in a hinged cover that covered the keyboard when the machine was not in use. The mouse

A portable building, or demountable building (Australian English), is a building designed and built to be movable rather than permanently located. A common modern design is sometimes called a modular building, but portable buildings can be different in that they are more often used temporarily and taken away later. Portable buildings (e.g. yurts) have been used since prehistoric times. The most familiar modern type of portable buildings are designed so that one can be carried to or from site on

The Oerlikon 20 mm cannon is a series of autocannons, based on an original designed by Reinhold Becker of Germany, very early in World War I, and widely produced by Oerlikon Contraves and others. Various models of Oerlikon cannon were used during World War II, and they are still in use today. During World War I, the German Reinhold Becker developed a 20 mm cannon, known now as the 20 mm Becker using the API blowback (Advanced Primer Ignition blowback) method of operation. This used a 20x70 RB

December 20 is the 354th day of the year (355th in leap years) in the Gregorian calendar. There are 11 days remaining until the end of the year.