OpenSUSE Install :: Autostart In GNOME But Not KDE?

I'm a KDE fan giving GNOME Shell a try, and I find I like it better with a dock. The one in GNOME Shell extensions is still primitive, so I installed Cairo and set it to start automatically, but then I found it starting in KDE too, where I prefer the Plasma Panel. So I disabled it for autostart and checked "Restore Programs" in the Startup Manager instead, but that didn't do the trick. Now I'm thinking that instead of an autostart entry for Cairo dock, I should have one for a script that says, "IF running GNOME, THEN launch Cairo, ELSE leave well enough alone." Can anyone here tell me how to do that? I've never written a script, but I figure the internet can help me with the basics; the piece I'll need is a way to check whether I'm in GNOME.