How does YAHOO change its URL to a NEW URL

I was on YAHOO and I typed in a search name.  Soon it comes back with the results and I noticed that it has changed its URL toi somethign else with my search pattern in it:
ie.  http://search.yahoo.com/bin/search?p=halle+berry

Originally the screen was your usual text input box form.  It submits the entered text to: http://search.yahoo.com/bin/search

How did it wind up "adding": ?p=halle+berry  if I originally called the search engine without it?  Did it possibly "recall" itself with a LOCATION http header command in CGI and added the query string data?!

And if they're using the LOCATION command, I thought it isn't 100% perfect meaning not all browsers can support it?  Wouldn't it be very risky for YAHOO...
mirrorAsked:
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haystorConnect With a Mentor Commented:
It is sending the information using GET, instead of POST.
GET puts the info into the address.
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