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NET's List View (made using the cool Sphinx documentation tool). Good programmers want to do the minimum amount of work (sloth).
This attaching was often done by creating one or more zero-width columns, or by setting the so it knows what image to show against each row. Very often the image to be shown depends on the model object being displayed.
It could be the list of clients for a business, a list of known FTP servers or even something as mundane as a list of files in a directory.
User interface-wise, the is to make the programmer's life simpler.
For large lists, this is a massive reduction in resources.
If the user never looks at the 4-millionth row, the Tree List View works best when there is a significant overlap of information between branches and the leaf nodes. They also work when the branches have no information apart from their name and the columns are really only used for the leaf nodes.