Browserstack : real web-based testing on VM

Today I’ve discovered a great testing service : browserstack.
You can test using a REAL OS your web pages, and see it using : Windows XP, 7, 8, OSX Snow Leopard, LION … and also IOS/ANDROID using the emulators.

Available browsers on Windows 7:

You can test a public url over the internet and …. an internal URL.

Wait! Internal URL?

Yes you can also test your local web application using a little java proxy program:

And after the connection:

After the connection:

And here is the test VM (the screenshot refers to a local web page on different port):

The only word to describe this service is : MAGIC!!!!!

Note: this is a real OS (with limited features for security reasons), here is the demonstration:

XP:

OSX: