Cookies will be tied to an individual machine--even on a dynamic ip.

There are many other ways to try and identify unique visitors, including matching the user-agents details in addition to the IP, serving cookies as part of your response, c: it is, after all, a core functionality in the field of web analytics.

MAC addresses are simply not part of the gamut of techniques that it makes sense to utilize for it-).

For example, an activeX component, java applet or a client application.

In other words, you have to build your own front end browser to handle logging in.

Then once the user is logged in, you can launch the app in the default browser.

Then if a site had a button that said Register this device the web application could do so without needing an additional native app installed (after all, the browser IS a native app).

You are right, cookie isnt reliable, but in some situations, its acceptable.

Any backend language will do (add cookie in the server side).

You can set the cookie in the client side using JavaScript too.

Provide details and share your research But avoid Asking for help, clarification, or responding to other answers.

Making statements based on opinion; back them up with references or personal experience.

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