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That FontBook is not compatible with Lion and so is no longer useful. Or any font when you wanted to know how to type in something (shift-option-K).
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It was incredibly useful for symbol fonts and other wingdings fonts, etc. There used to be an application called FontBook (not the same FontBook that comes with OS X, which is confusing) that allowed you to print out sheets that showed you what would happen if you typed a, A, opt-a, and opt-A in any given font. I've had this same question myself and it's interesting to see how often the question is misunderstood in the forums I've seen it posted in.
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Which means you also have to send every possible font that may include a dingbat you used to the printer to make sure they have it. So if you have a half dozen or more such fonts open, you need to have all of them available all the time in order to be sure the one you chose is used in the document. As I recall, it doesn't even tell you what font a dingbat is in when you select it. Yes, you can choose Dingbats to see all dingbats, but that's a concatenation of all dingbat glyphs. Using the Character Viewer isn't a great choice. I doubt you'll see a return to a Keyboard Viewer that will show the glyphs of a chosen font, so you'll have to rely on an app like Ultra Character Map, or (ugh!) Font Book so you can see all glyphs in one font. This is just one of many, many Unicode fonts which contain glyphs without a Unicode value assigned to them. Ultra Character Map will show all of them. None of those will ever appear in PopChar under any setting, so you would have no idea these swash, ligature, dingbat and other glyphs even exist. Note the large gap of glyphs with no Unicode value assigned to them between 02C7 and 00A4. You cannot in any way make it show you glyphs in a font that do not have Unicode values assigned to them, and that includes many Unicode fonts! As an example, here's Adobe's Caslon Pro Italic from Font Folio 11. At least if you're using non Unicode fonts, it is.
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