In the design snippet in the attachment a way to buffer a sequence of 3 images and output them simulataneously is implemented. With simple modifications the example can be modified for other image sequence lengths. To process images of a sequence simultaneously is e.g. important for High Dynamic Range Imaging or Exposure Fusion.
Please see also the Visual Applets example implementations (in the installation directory) for High Dynamic Range Imaging and Exposure Fusion to see the usage of the image sequence operation.