How to access any Mac system preference in one click

[iMore.com]

Want to make a quick change to any System Preference setting? No need to open the System Preferences app, just click it from the Dock. Here's how!
Apple guru Dave Marra recently tweeted a great Mac tip that I'm going to share with you. Make sure to check out his Marrathon.com site for more great Mac tips.

I have to admit that I'm totally ashamed I didn't know this until just the other day, because Marra tells me it's been around since OS X 10.7 Lion.

Full story from the iMore Blog...