Need help with VTserver

Thanks to a creative suggestion from Ethan, I want to use VTserver to transfer a bootable OS/8 RL02 image from my laptop (which works fine under SIMH PDP-8) to an RL02 pack on my 11/23+. Then I will remove that disk from the drive on the -11, place it in the 8/A's RL02 drive, and voila - it should boot OS/8! (The disks are identical format regardless of system, only the programs themselves differ). Meanwhile I am confused about VTserver's use and terminology of serial ports. I got a PC-executable version here: http://home.alltel.net/engdahl/vtserver.zip and modified the .vtrc file (as recommended in the embedded comments) to send only two tape records, "copy" and the RL02 image. I realize a null modem cable will need to be made. So far so good? But I don't understand the difference between, say, "ttyd1" and "ttyp9"... those are Unix terms, not DOS... will one of these be correct to enable the serial port connector on the back (one of the COM ports)? If not, how do I patch this? I was a hardware designer and 8/16 bit assembly language writer (and that was over 20 years ago) and definitely never a C, Unix or Windows programmer, so please bear with me. Any helpful hints appreciated :) -Charles