Hogwarts Portraits

[Natalie]

No: HPFGUIDX 23607

Yeah, I know there was a fairly recent discussion of the nature of the
paintings at Hogwarts, but...

Today's page of the WB desk calendar said something along the lines of "The
portraits of Hogwarts alumni can leave their paintings and go visit others."

So are the Fat Lady and Sir Cadogan actually alumni? If they are, do they
retain any magical abilities? Of course, it could just be yet another flaw
in the WB merchandise, and, although it did get me wondering, I'm inclined
to doubt it.