I must be getting confused with the Universal remote (55015) that has the function symbols, sorry.Thanks.
The link with pdf files is a nice resource. I found the long gone manuals for my locomotives. Although, in my case the decoder was added by LGB USA during a year I spent there so it's not covered in the original manuals.
As others have suggested I am successfully testing with a test loop.
Also on my 55016p the only icon's are for lights, loco #, and direction. There are no icons for bell, whistle or smoke. It's good to know that random key sequences can't hurt so I'll play with it.
Is the "F" key used for anything other than configuring.
Even though I would like to have more documentation, it does seem a lot easier for both setup and operation than what I had been doing with my analogue setup to operate multiple locomotives. I should have done this a lot sooner.