Transaction Processing is used by large banks, credit card companies, and hotel chains. Datalogic bar code scanners are replacing common transaction processing activities i.e. in banks by automatically tracking the movement, filing, location, archival, maintenance and destruction of client documents. This comprehensive system allows employees to identify documents by reading a unique bar code label on the document, improving speed of service and enhancing productivity. By eliminating outdated manual processes, banks can experience a significant reduction in errors which is critical to maintain client satisfaction. Moreover bar code readers can be used to quickly verify the authenticity of currency and other documents such as passports and government issued ID cards.