an example can be found on AMOSPro_Tutorial:Tutorials/Iff_Animation.AMOS
Loads an IFF animation sequence from the disc and plays it on the screen.
Iff Anim "filename" To screen
"filename" is the name of the animation file you wish to display.
screen chooses a new AMOS screen which will be created especially for your animation sequence. If the requested screen already exists, it will automatically be replaced by your new definition.
Iff Anim "filename" To screen,times
times sets the number of times you wish to repeat the animation on the screen. If it's omitted, the animation will be displayed exactly once.