How to use the background viewer:
(1) Put aesddd.prg in your AUTO folder (it doesn't matter whether
it's before or after MiNT).
(2) After the desktop comes up, run LOADBAK.PRG.
(3) Leave it running; when you want to change backgrounds, select
it from the Desk menu and do so.
BUGS:
If you don't have MultiTOS running, LOADBAK is pretty useless, since
as soon as it terminates the background goes back to black. We'll
have to do an ACC or CPX version of this at some point.