[www3.google.com...]
and search as normal. The results you will get are (hopefully, fingers crossed, knock on wood) the new update results that will over the next few days migrate to www.google.com
(osomeone explained www3 and www2 as a kind of "staging area" for the update.
There has been talk on these boards in the past about using keyword.domain.com , I dont think there ever was a decision as to this being good or bad for google rankings. If you go to your webhosts website they may have more information on dns setings and how you can alter them.
!PLEASE BE VERY CAREFULL WHEN ALTERING YOUR DNS!
(edit for typo)
[edited by: mack at 4:33 pm (utc) on Aug. 23, 2002]
Normally they would map this subdomain to another directory in your main website. There are other configurations, but this is the one I'm familiar with. You would not register www2.mysite.com, just have www.mysite.com registered. Everything else is handled at the server level.
Noting how the usage of the "http://" prefix has dropped off for many situations I would not be surprised to see the same thing occur for the "www" prefix eventually.
for example ad.doubleclick.net may be redirected by www2.yoursite.com
or if you are having different ad server or a different database server you can assign it accordingly.
Just a matter of smartness :)