I'm using Werner's solution to the specified floating-text-box problem, but there is no way to specify which page the result goes on. I was wondering if there's a way to tell AddToShipoutPictureFG which page to go onto.
So, like the interface, instead of being
\placetextbox{<horizontal pos>}{<vertical pos>}{<stuff>}
would be
\placetextbox{page}{<horizontal pos>}{<vertical pos>}{<stuff>}
\AddToShipoutPictureFG(no star) and then added an\ifthenelse{\equals{#1}{\thepage}}{asdf}{}. If you want to mark this question as a duplicate of that one or answer it, go ahead – k_g May 24 '16 at 20:15