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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-]).

 
 

Dan Frakes Explains Power Nap

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Mountain Lion offers a new feature called Power Nap, but since it’s limited to only a few recent laptop Mac models, most people probably haven’t seen it. In short, Power Nap enables supported Macs to wake up briefly to back up via Time Machine, check for email via Mail, receive new messages in Messages, and update iCloud-related data, including calendar events, contacts, reminders, notes, iCloud documents, and photos in Photo Stream. Over at Macworld, our friend Dan Frakes explains just what Power Nap can do, how you use it, why it works on so few models, and more.favicon follow link

 

Comments about Dan Frakes Explains Power Nap
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Something I have not seen discussed anywhere is a similar feature that already exists apart from PowerNap in Mac computers. My own 2010 MBA which does not support PowerNap performs a "Dark wake" each morning when I detach the power cord and then connects to my Airport network and downloads all e-mail, without me opening the lid of the computer. This is a real feature apart from PowerNap, but I am not sure in what models it works or how long it has worked like this. See the Console logs! -Jerry
It also seems to take consistently longer time to wake from sleep when opening the lid after it has previously made a dark wake than when it has not done so since you last closed the lid. I know this happened in 10.7 Lion too (but not sure it worked that well and maybe Mail messages were not downloaded). Mail messages download without using push. Not sure what other services works in Dark wake, but Dropbox does not sync. There were an article a year ago in Macnews on this: http://www.macnews.com/2011/08/09/apple-working-dark-wake-methods-macs