My apologies for the many messages, but I just had a breakthrough - albeit one I should have seen sooner... The way to do automated calling is to edit the QTRgui settings file that is (in windows) C:\Users\...\AppData\Roaming\QuadToneRIP to the settings that are required, then save and close the file, and then in command prompt, just write the following:
QTRgui.exe "image_file_name.tiff"
This will automatically open and print the file!!
And here I was trying to over think it...
Regards,
Kaz