Thanks, I did that and the technician was very helpful. He thought he recalled that a custom RS-232 serial cable is needed. Also, my model of signal generator may not work with some of the software I downloaded. He pointed me to another Keysight web page where there was some other software called Inuilink.
I think I will buy one of those Agilent GPIB to USB adapters that are for sale on eBay just now and see if that works.
My model of signal generator is analog, so there will be a limit to what I can do.
Richard