Originally, I developed the kt33220 driver (formerly called the key33220 driver and maybe even agilent33220) to control the Keysight/Agilent 33220A. I recently added the kt33000 driver to use the Keysight 33512B function generator. In the Keysight IVI.NET/IVI-C README, I noticed that the kt33000 driver supports the 33220A function generator, so I really only need the kt33000 driver if I develop it properly.