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On the default install, there is a message when you are NOT logged in:

"If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below."

I want to not only change this message to something else, but also have it displayed when people ARE logged in.

Where and How can I do that Or something similar?