Which managed server needs Java Object Cache and how to verify JOC is running

Since I work for the Oracle WebCenter A-Team I will post all my new blogs on our internal blog system. Because I do have a lot of committer to RSS I will post here references to my new articles. So this is going to be the first one.
My college Yannick already wrote very good article about how to configure Java Object Cache in clustered environment you can find HERE.
There are two things on top of that, I would like to share regarding the Java Object Cache: which managed server needs JOC and the second one is how to verify if JOC is running.
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