Um, go to the gmail website - www.mail.google.com or www.gmail.com and login and look at it there? Or are you asking something different? If you have gmail set up as IMAP, all your messages will be the same on your computer and on the web. If you are set up as POP, then the messages will be on the web until your computer at home downloads them (unless you have it set to keep all messages on the server).