Is KDE running?

[John MacMillan]

What's the right way for a script to tell if KDE is up and running, ideally that works with older versions and is likely to work with upcoming ones? Eg. is there an environment variable, or a command that will succeed/fail?

I have a script that starts an xterm, and I'd like to make it KDE-friendly by using konsole if KDE is running.

Thanks!
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