Hey there,
this is handled via stagelink. There are like a handfull of different options from differnt people. It depents what you want.
There is a major Stagelink Thread here Stagelinq protocol API availability? (Part 2)
It contains information about the app nowplaying2, djctl and some more.
nowplaying2 should be compatible to denon gear but as far as I know only djctl are able to handle all this without any 18xx series mixer on the sc5k sc6k models.