Currently there is only one input processing output stream present in the system. However, the motivation for having more is that the ilViewer class utilised in the OutputIlStereo module can very easily display any number of arbitrary images. As such, it might be possible to have several of these streams proceeding together, with the output window displaying all of them together. Output module which cannot handle more than one input stream may have their input streams blended in some manner, for example, by tiling the images from the input streams in a mosaic.
However, this would require far-reaching changes throughout the framework, including changes to the method of specifying modules and parameters and the way the Images pass through the system in their currently straightforward fashion.