如何唯一标识访问我的网站的计算机？

我需要找出一种方法来唯一地识别每个访问我创建的网站的计算机。有人有任何建议如何实现这一点？

I need to figure out a way uniquely identify each computer which visits the web site I am creating. Does anybody have any advice on how to achieve this?

因为我想要解决方案在所有机器和所有浏览器（在原因）内工作，我试图使用javascript创建一个解决方案。

Because i want the solution to work on all machines and all browsers (within reason) I am trying to create a solution using javascript.

我感谢您的帮助。非常感谢。

I appreciate the help. Thanks.

编辑：

Cookie不会。

Cookies will not do.

我需要能够基本上创建一个对计算机是唯一的guid，并且是可重复的，假设计算机没有发生硬件变化。我想的方向是获取网卡的MAC和这种性质的其他信息，这将是访问网站的机器。

I need the ability to basically create a guid which is unique to a computer and repeatable, assuming no hardware changes have happened to the computer. Directions i am thinking of are getting the MAC of the network card and other information of this nature which will id the machine visiting the web site.