Powerdog Linux?

I was looking at instructions for ActiveMQ on this page:

http://activemq.apache.org/getting-started.html

It refers to environments ActiveMQ can run in, including "Unix: Ubuntu Linux, Powerdog Linux, MacOS, AIX, HP-UX, Solaris, or any Unix platform that supports Java."

OK, so what is PowerDog Linux? Google and Ask.com are no help here: A search for "Powerdog Linux" just brings up lots of references to a similar list of environments. It seems inconceivable (maybe that word doesn't mean what I think it means?) that references to an imaginary distro would be that widespread.

Vic
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