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Couple occurs as standard for contracting input from either image scanners: an image capture API for Microsoft Windows and Apple Macintosh operating systems. A standard was number one freed around 1992. These are presently ratified at version I.Nine when of January 2000 & is maintained per [http://www.twain.org TWAIN Working Group]. Pair is usually utilized as an interface between image processing computer software & the market scanner or even digital camera.

A word Pair is from either Kipling's "The Ballad of East and West" - "...and never the twain shall meet...", reflecting the difficulty, at the time, of connecting scanners and personal computers. It was higher-cased to Pair to produce it other distinctive. This led humans to imagine it was an acronym, then to the contest to came higher by having an expansion. None were selected, & up to now no "official" acronym. (A entry "Technology Without An Interesting Name" continues to haunt a standard.)

the disadvantage of Distich is that it doesn't separate a user-interface from either a driver of a device. This makes it hard to provide transparent network access. Anytime an application loads a Span driver these are totally unattachable from either the supplied manufacturer's GUI. The guide to this is an open-source piece of package known as SANE (Scanner Access Now Easy).

The TWAIN Working Group
A not-for-profit organization which represents the imaging industry. TWAIN's purpose is to provide and foster a universal public standard which links applications and image acquisition devices. The mission of this organization is to continue to enhance the standard to accommodate future technologies.

Linking Applications and Images, What Is TWAIN?
Standard software protocol and application programming interface for communication between software applications and image acquisition devices. Article by Hewlett-Packard.