Go to settings, labs, make sure "Offline" is enabled (it should be the first one), and save changes. Gmail should restart, and next to settings, there should be an "Offline" button, along with a green vial (which symbolizes labs). Click "Offline", and if you are using Google Chrome, you can add a shortcut to your Gmail on the desktop. (This may also work with internet Explorer and Firefox on Windows, and Safari and Firefox on Macs, if you install Google Gears).
Gmail has an offline feature. If you enable this option, then all your mails will be downloaded to your computer as soon as you connect to the Internet so that you can view them offline You can even compose an email which will be sent the next time you connect to the Internet.
You can make the status of the gmail Invisible. This makes others do not know you are online. Irrespective of you being online, it shows you offline.
You can use pidgin. www.pidgin.com
The mails that are showing must be a part of Gmail offline. And you must have left your account open. That is why they are showing without signing in.
You can't use if offline whilst on your computer but you can use it on your phone.
Use Gmail notifier
You can't use Facebook offline; it's impossible.
Yes, you can use gmail on the iPad.
use some offline browsers
Yes you can use gmail as a back up email server. It si necessary to enable IMAP in gmail before using gmail back up.
They use Gmail, an email website to Gmail chat with their other friends who have gmail. They use IM programs. They use Facebook, myspace and Twitter to communicate with known and unknown people.
no