Go Back and Forth Fast in Preview
If you're reading a PDF in Apple's Preview software, and you follow a bookmark or an internal link to move around within the PDF, you can quickly return to where you were by pressing the keyboard shortcut Command-[ (that's Command-Left Bracket). Or, you can choose Go > Back.
The command works iteratively, so you can go back to just the previously viewed page or if you issue the command again, to the page before that, and so on. There's also an equivalent Go > Forward (Command-]).
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It appears that Apple has pushed Snow Leopard off the back of the support truck, releasing the most recent security fixes only for Lion, Mountain Lion, and Mavericks. Adam Engst explains what’s likely behind the decision and offers suggestions on what Snow Leopard users can do next.
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