If FROM2 is not supplied then this parameter is optional. If not supplied then the edge detected image is displayed on a screen. Any key can be pressed to stop the image being displayed. Click in the top left corner and try again if the key is ignored. If it is supplied then it gives the name of the file to save the edge detected ILBM Black and White image.
If FROM2 is supplied then this parameter must be supplied and gives the name of the file to save the MPMorph ARexx script.
This can not be changed from the GUI.