US Patent 7196691 Multi-key macros to speed data input

Systems for initiating the execution of a macro by simultaneously depressing multiple keys and for reducing the misclassification of keyboard input by distinguishing between rollovers in normal typing and the simultaneous depression of two keys. Only keystrokes that follow a pause are considered candidates for macro initiation. Keystrokes not separated by a pause are dispatched to the operating system for normal processing. If a user types in a normal fashion, no macro is recognized, and the user experiences no unexpected behavior. A user dictionary of macro definitions is used to determine whether the first keystroke is part of a macro input pair.