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What are some useful, undocumented Mathematica functions?



There have already been some questions about some undocumented functionality in Mathematica. Such as (please add to these lists!)



Also, other questions and answers that contained undocumented functions



Along with the "Undocumented (or scarcely documented) Features" segment of the What is in your Mathematica tool bag? question.


Szabolcs also maintains a list of Mathematica tricks which contains a list of "undocumented stuff".



So, what undocumented functions do you know and how do you use them? (Added useful information is maybe how you discovered the functions and any version dependence.)




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