Reading value from website and store it in local variable

Hi

I am not sure how this can be achieved. I am new to NSIS and evaluating different installers.

What I need to do is to bring up a webpage and register a user during install (using one of the plugins), and then get request a unique serial key from the website that needs to be written into the registry by the installation app when registration is successfull.

My question: How can I pass a url to a website, and have a value returned and assign it to a local variable to continue my script?

TIA

The value would have to be stored on the server temporarily under the users' IP address for example. Then have a server-side executable which outputs the serial key, which you download with InetLoad plugin.

-Stu