TWAIN 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. Twain - Toolkit without an interesting name from Dictionary of PC Hardware. TWAIN