OK, this may be just for me. Let’s say you’re doing some work at Palo Alto’s Main Public Library. You’re working on your Powerbook and you need to print something. The good news: unlike many libraries, you can print from your laptop.The bad news: there are several printers to choose from, you can only print to one of them, the instructions provided by the library don’t explain which one, and the staff may or may not be able to tell you.
Hmm, that just happened to me, but with some help and good old trial and error, we figured it out. So, at this moment, the following image may be worth a thousand words:

Your mileage may vary…