
chapter 13: system preferences 377
• Xgrid: This feature is another one that should be labeled “nerds only.” Avoid it
unless you have software especially designed for large-scale network processing
tasks.
The Firewall tab is described starting on page 250, and the Internet tab is explained
on page 254.
Software Update
In any project as complex as an operating system, there are always bugs to be fixed,
features to be sped up, and enhancements to add. That’s why Windows has Automatic
Updates—and why Apple has Software Update.
Whenever Apple comes up with a new software fix, this program can notify you,
download the update, and install it into your System automatically.
Software Update doesn’t automatically download the new software unless you turn
on the “Download important updates in the background” checkbox. No matter what,
though, Software Update always asks you before installing an update, as shown in
Figure 13-13.
For maximum effortlessness, turn on the “Check for updates” checkbox and then
select a frequency from the pop-up menu—daily, weekly, or monthly.
Note: Software Update also keeps a meticulous log of everything it drops into your system. On the Install
Updates tab, you see them listed, just in case some tech-support person ever asks.
Sound
Using the tabs of the Sound pane, you can configure the sound system of your Mac
in the following ways.
Sound Effects
“Sound effects”