Cookies

"Cookie" is little morsel of information sent from Web server to Web browser (usually during first visit)

After browser receives cookie, whenever requests Web page from that server, sends back that cookie

Shopping applications can store information about past (or currently) selected items

Fee services can send back registration information -- freeing client from typing IDs and passwords

Sites can store user preferences on client

Cookie might be...

.msn.com,Science&Technology,
      Dilbert,Local Weather

Why keep cookie at browser instead of server? Faster!

Cookies can be modified, removed, expired

4K (4096) character limit per cookie

No more than 20 cookies from any domain

300 cookie limit -- cookies used least recently removed