1. Apparatus for determining whether a programmable pacing generator has been successfully programmed, said pacing generator including memory means for receiving and storing signals indicative of the parameters and/or modes of operation to control the application of its stimulating pulses to a patient's heart, means responsive to the storage of the encoded signals within the memory means to provide an indication thereof, and generator means responsive to the indication for generating test pulses in addition to the stimulating pulses, indicative of the successful programming of said pacing generator, said apparatus comprising: (a) keyboard means for receiving and entering by operator manipulation parameters and/or modes of operation in which to program said pacing generator; (b) transmitter means responsive to the mode of operation and/or parameters entered via said keyboard means for encoding and transmitting corresponding signals to said pacing generator; (c) means coupled to the patient's body for sensing the patient's heart activity signals including the stimulating pulses and test pulses; and (d) means responsive to the transmission of the encoded signals to said pacing generator for initiating the detection of the characteristics of the test pulse and for determining whether the detected characteristics meet given criteria and if so, for providing a manifestation that said pacing generator has been successfully programmed.