This means that any modern piano with an appropriately equipped YAMAHA Disklavier system can read a MIDI file and parse the commands inside to play the notes. Pianos with a Disklavier system ...
The situation as explained to me is that in the late 1990’s, my brother’s employer purchased a Yamaha Mark II XG “Baby Grand” piano ... or so back, the piano’s Disklavier DKC500RW ...