So many times we saw the turbo link in the upper right corner of the admin area. (Remember when computers used to have a Turbo button?) Behind it is a new feature of WordPress.com, support for Gears.
WordPress bloggers must install google gears
In 2007 Google launched its new product called Google Gears. Google Gears makes it easy to browse the Internet, or sites you have already visited so you can visit them again using an amazing cache technology.
Following article which is written by Matt (Founder of WordPress) is really helpful about knowing about wordpress and google gears.
You can go to following URL and download google gears and install it on your local machine.
The Google gears is available for Windows, Windows Mobile, Mac OS Tiger/Leopard, Mac OS Snow Leopard, Linux and Android.
So just install it your local computer.