Sorry probably making a simple thing more complicated, On a UK/Irish and probably other Non US keyboards the right
Alt key is marked as
Alt Gr Alternate Graphics it allows you to access the 3rd symbol of a key, eg the £á on the 4 key (which contains the symbols 4 $ and £á ) i suppose it's like
Ctrl and
Alt combined.
Yeah, you can take a screenshot with just the Alt and Print Screen, just i'm so used to using the Alt Gr key

Actually it'll probably have made sense to terry as he more than likely has that key.