Thoughtful, detailed coverage of the Mac, iPhone, and iPad, plus the best-selling Take Control ebooks.



Pick an apple! 
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-]).


Article 1 of 2 in series

Bandwidth and Latency: It's the Latency, Stupid (Part 2)

[Last week in TidBITS-367, Stuart examined issues of latency and delay in typical modem-based Internet communications. This week, Stuart offers general observations on how bandwidth can be used more efficiently and how it effects the overall latency of a connection.] Last week, I asked readers to imagine a world where the only network connection you can get to your house is a modem running over a telephone line at 33 KbpsShow full article

Article 2 of 2 in series

Bandwidth and Latency: It's the Latency, Stupid (Part 1)

Years ago David Cheriton at Stanford University taught me something that seemed obvious at the time - if you have a network link with low bandwidth then it's easy to put several in parallel to make a combined link with higher bandwidth, but if you have a network link with bad latency then no amount of money can turn any number of parallel links into a combined link with good latencyShow full article

Show the full text of all articles