What are import wizards?
Import wizzards are plug-ins, importing data. This can be from the file-system, but also more sophist aced plug-ins for instrument control and data-acquisition. Note, that these plug-ins are not importers, but rather generators or organisers.
An example is the quick-time demo plug-in, a simple application grabbing image frames from quick-time compatibles cameras. Subsequent, a viewport is used for data visualization and browsing. This is is done with viewport plug-in families, e.g., the grayscale viewport family intended to import and visualise scietific images.