Getting ipad device information using safari web browser

We have an web application which users access from the iPad safari web browser.We want certain kind of analytic about the users. I want to know what information can i get through th开发者_如何学编程e safari browser about the user`s iPad.Can i access 1) iOS version installed. 3) Safari web browser version. 2) UDID of device.

You can analyze the User Agent ID, and it will tell you which iOS version is used and the version number of MobileSafari, but AFAIK there is no way to query the UDID (luckily, I might add, since that'll be an even nastier privacy issue than cookies already are).