You must mean the BREADWINDOW system!
Explanation:
Late 80s at MPA and a call to tower: "Breadwindow3 MPA Tower" lots of strange callsigns down their so replied "Breadwindow3 MPA tower pass your message".
After some heated words an Army 2nd Lt came to the tower to complain we had been using aircraft types on the Storno and had we not heard of the Breadwindow system!
It kept us amused for some days!
PM