I have the user manual, send me your e-mail address in a PM and I'll fire it off to you.
Does your unit have GPIB and serial interfaces? This is part number PM8956A and it has its own separate user and service manual, which includes the command protocol for remote operation. I'll send that along too if you don't have it.
update:
I sent you three e-mails: the user manual PDF file, the GPIB option PDF file, and a HTML format user manual that I created.
Mine has the math option, which can do FFT and perhaps a few other things. I've used the FFT to analyze the residual (distortion) output from my distortion analyzer. It lets me see the relative levels of the harmonics.
I have tried the GPIB port, and was able to capture a screenshot (print screen) using
7470.exe, but it was very slow.