What's the general technique used in web languages to allow non-registered users to vote?

They use cookies or sessions to identify the computer, that has already voted. If you understand Javascript or PHP a bit, I can give you some examples.

The usual technique is to use cookies. IP addresses is not enough because a lot of places these days use NAT (offices, cybercafes, most homes with DSL routers).

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.