Open Command Prompt during the install phase
It is possible to open a command prompt during the GUI mode setup, by pressing SHIFT + F10. This can be useful if having the product key placed in a text file on the install CD / DVD. It can also be used to launch other application during install ex. a game like Pinball.
More Info MS KB242380
More Info MS KB923834
More Info MS KB923834 (Disable SHIFT+F10)