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I was totally dragged off from my routine work after tried Google Suggests for the first time. Wondered how it is doing all that so faster way?

Guessed it correctly on RPC calls. A great work on XMLHttp. My Buddy Teucer had given few gyan on the same from Slashdot.org and Joel On Software.

I found one more interesting analysis on the same here (Auto Complete comes of Age)

Just to dig through this, I had set up a side bar of Live HTTP Headers for FireFox and observed a very very simple communication between browser and Google.

When I tried my name "Sudhakar Sadasivuni"

From Browser to Google
GET /complete/search?hl=en&js=true&qu=sudhakar%20sadasivuni HTTP/1.1
Host: www.google.com
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.2; rv:1.7.3) Gecko/20041001 Firefox/0.10.1
Accept: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Connection: keep-alive
Cookie: PREF=ID=153437983ed96ad9:CR=1:TM=1101787951:LM=1102999867:GM=1:S=OoygLXkhpj3r2pL8
Pragma: no-cache
Cache-Control: no-cache

From Google to Browser
HTTP/1.x 200 OK
Via: 1.0 MSWIPGATE
Content-Length: 105
Date: Tue, 14 Dec 2004 10:13:30 GMT
Content-Type: text/html; charset=utf-8
Content-Encoding: gzip
Server: Auto-Completion Server
Cache-Control: private, x-gzip-ok=""