A set of new printing functions are implemented as defining commands to make it possible to add graphic effects to a printout of a POS printer. These functions are based on a method of designating usually cyclically re-occurring byte strings, usually text in receipts, to act as triggers to launch the...http://www.google.com/patents/US20040167993?utm_source=gb-gplus-sharePatent US20040167993 - Graphical printing system and method using text triggers
