For anyone wondering how to get PinballX and RocketLauncher to communicate, see this link here: http://www.rlauncher.com/wiki/index.php?title=PinballX
MAN did i waste hours trying to work this out. Also, to get the screens to switch between backglass and playfield, you need to enter the instructions you want in the "parameters" section of both launch before and launch after fields in PinballX settings.
I can't tell you how much trouble it caused trying to make this happen - a word to the wise - never download dodgy files on your pc from even remotely shady sites. My butter smooth Win 7 vpin with pc games has now become a fair Win 10 setup that's buggy with FutureDMD. Best to stick with Multimonitor Tool and just nut it out.
Anyway, thanks heaps Terry, your forum posts guided me in the right direction I'm pretty happy with how my system is running now. Good luck with your cool looking pincab!