It's probably anything with a serial number, which would include the Syslite, CMS, Sysport, etc. Pretty sure the modules for the CMS do not have serial numbers.
I picked up two syslites and got £50 off each with the vouchers, had wanted them for ages, discount persuaded me to purchase, also purchased 2nd CXS, this one came in no2 systainer with attic and drill bits included.
I have now moved my 18+3 into this box as it was always a struggle to fit it in a sys 1 as I also have the depth chuck for drywall in the box, I can fit 2 CXS's, 2 spare batteries, 2 angle chucks, 2 centrotec chucks and 1 charger in a sys 1, which left me with a spare sys 1 for my dust extractor cleaning kit.
My guess is that if it had some way of conducting electricity through any mechanical parts (power switch in the CMS-GE) it would be a 'machine' by Festools definition. But this is obviously just my guess of a common denominator.