A processor having multiple distinct instruction sets is disclosed where one set, a default set, is always available for execution while a second set is only available once a valid control code is externally supplied to the processor to effectively “unlock” and enable the second set. Once the second set is so unlocked, then the instructions in both sets are available for subsequent execution by the processor to provide enhanced functionality only available through use of the second set, such as accessing on-line services and content information. Multiple unlockable instruction sets can also be similarly provided, each being separately unlocked and enabled through entry of an corresponding externally supplied control code.