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Updating a hosts file on a mac in OS X Leopard is a little more difficult than a PC.http://www.apple.com/downloads/macosx/internet_utilities/hostal.htmlIt is possible to edit the hosts file direct but it is a bit techie on OS X. You need to do EXACTLY the followingYou must have access to log in as the root user - http://support.apple.com/kb/HT1528?viewlocale=en_US

1. Log out using the apple menu (top left)
2. Log in as the root user
3. Open Applications > utility > Command ( this is the command prompt for the underlying unix of os x)
4. Type the following
   1. cd /etc
   2. vi hosts
   3. e (press the letter e)
   4. use down arrow to get below last item in the list
   5. right arrow to get to nd of row
   6. press a (the letter a)
   7. press return
   8. type ip tab webaddress you want adding eg.
      1.  78.136.0.162      www.livelinknewmedia.com (there is a tab between the 162 and www
   9. Press escape
   10. Type :x
   11. You have edited the file now
5.  You must flush your dns by typing
6. sudo dscacheutil –flushcache
7. Done – you should be able to see the site you added now.