Hi
This will really depend on how you wish to control this, and also what kind of service you will use this on!
voting control...
1. if this is used in a session type service -> ie: username and password -> then use the username!
2. if this is not used in a session type service, then use a 'IP' flag or a cookie, if you find the visitor has cookies turned on!
Here are a few problems with (#2)...
1. Cookies are turned off via the browser on average 3 out of 10 visitors!
2. A 'IP' can (1) change or (2) be a member of forwarding proxy that many visitors will be using as the same 'IP'
Now (#2) is better because you should never base anything on what you can not control, such as javascript or cookies!
(#2) will be somewhat flawed unless your using it in a protected member type enviroment, but it will still give the best result for a simple poll!
If you would like an example of a simple 'MULTI POLL HANDLER' script with a simple but powerful 'Admin Manager', just tell me and I will whip up a quick one!
John