I mean when I enable the tiles button in the UV options with GLSL it doesn’t seem to do anything visually. But even before I never got what it does, a quick look at the manual didn’t help. It must do something if Brecht comitted a fix for it recently. Just to note this is the one where the tooltip says enable tilemode for face.
I remember Fligh (Godspeed wherever you are) send me a demo file. If tiles is sent, the GE plays the texture in storyboard fashion, a crude kind of animated texture, but useful for small things like pulsating orbs, or security monitor displays.