Human - computer interface devices, namely, joy sticks; computer software for controlling input and output data in connection with computer interface devices such as keypads, mouses and monitor screens; computer clocks; computer keypads, namely, numeric electronic keypad; reverse keypads, namely keypads having key switches arranged in an array facing away from the keypad operator; computer controllers, computer monitors and display screens; computer software for enabling the creation of key switch matrixes and isomorphic symbols for input and output leads functioning as an encoder or decoder between a computer and an interface device such as a mouse or keypad; and electric push button switches