Prior art anyone? (Score 5, Informative)

There's so much prior art here it's not funny. For example, Executive Systems first published XTree for DOS (later XTreeGold) in April, 1985. It was the absence of this functionality in MS/DOS that make the functionality so popular. This is just another example of how the software patent system is truly messed up and needs (and hopefully will get) a serious overhaul.