Sequence File: A sequence file is an image file that contains a sequence of images.  Each image in the sequence is called a "frame."  Image sequences can be 'played' like a movie or slide show.   Image-Pro allows you to work with sequence files in three formats: *.avi, *.tif and *.seq.  The controls used to 'play' a sequence file appear on the View ribbon when a sequence file is active in the Image-Pro workspace.