How would you know you sent a cookie to them already?

>>How would the server know the browser doesn't support cookies? Unless it has a database of all the browsers it knows that doesn't support them.
>>
>>
>
>In addition to the other answers you've received, the easiest way to figure this out to to attempt to write a cookie out to the client. On the next hit, try to read it. If it's empty, the browser doesn't support cookies, or the user has disabled them.