Hide
Repeat : Until Mouse Key=1
Screen close 0
Edit

This loads the pic into screen 0, hides the mouse pointer and waits until you
press mouse button one before closing the screen and going back to the editor.
Once you have the screen in view, you can then move it. For this example, it'll
move up/down. Put this next listing after the line that says Hide and before
Repeat : Until Mouse Key=1.

Don't type the line numbers, these are here for reference !

1 -  Channel 1 To Screen Display 0
2 -  A$ "Loop: M 0,100,100; M 0,-100,100: Jump Loop"
3 -  Amal 1,A$