Abstract: A method and apparatus for enhancing the operation of computer keyboards. The keyboard includes a plurality of keys, and code generation means for producing make and break codes when keys are depressed and released. The invention comprises a processor coupled to receive the generated codes. The processor detects a sequence of codes serially including a make code of a trigger key, a make code of a target key different from the trigger key, and a break code of the target key. A timer determines whether the interval of time between the trigger key make code and the target key break codes exceeds a predetermined non-zero triggering interval. If the sequence is not detected, or if the triggering interval is not exceeded, then the processor outputs the codes produced by the code generation means. However if the sequence is detected and if the triggering interval is exceeded, modified codes are output.