how to send a cookie or something to client?

[Carl]

Hi,

i have an application for internet survey. I would like to send a cookie or
something to each client who fills the survey form in order to impede him to
fill the form several times.
Any hints are welcome.
Carl

 

[Carl]

Thanks for replying. You're right: he can move to another computer, but it's
better than nothing.

I'm not sure i understand what you suggest.

I see two cases:
1) i send the link of the form page to all the persons who have to fill the
form.
Assume user X is somebody who has the link.Do i have to generate a password
and send it together with the link? But then all the generated passwords
must already be in the database. Is this what you mean?

2) i send the link of the form page to e.g. a compagny or a school, and all
employees or students are asked to fill the form. How can i now use
passwords?

Thanks