You can't really since you need the digital certificates that the OEM used in creating the disc. The disc is installed, preped, re-sealed, then imaged for use on your machine. When it is re-sealed you get to go through the OOBE (Out of Box Experience) so that it can be configured for your use. This is all detailed in the OEM/System Builder handbook. If you go through that process you would need to re-enter the key anyways since the OOBE would end up reprompting for the key. The re-seal wipes out activation data on the installation.
