How do I upgrade my computer?

Current marketing material states that all installation media will contain all the functionality of the highest SKU (Stock Keeping Unit) and that higher level functionality will be disabled through winlogon.exe and pidgen.dll. This functionality is what is currently used in differentiating between Windows XP Home and Windows XP Professional. The benefit of WAU is that if one were to decide that they wanted Media Center functionality out of their computer that has Vista Home Basic, they could complete the update in a matter of minutes without needing to do a complete Operating System re-installation or an Operating system upgrade. A major drawback is that such a technology is potentially highly exploitable, making it possible for users to switch to a higher SKU through a possible security hole without purchasing an upgrade.