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Undocumented Features In 4.0


I was poking around the Wolfram Research FAQ web pages and went to
http://support.wolfram.com/Kernel/Symbols/Developer/index.html
and 
http://support.wolfram.com/Kernel/Symbols/Experimental/index.html

There I found what looks like lists of all symbols in the Experimental and
Developer contexts.  Several of the symbols listed there aren't documented
in the Help Browser, but I was able to figure out how to use two of them.
Below I demonstrate two of these undocumented features.  I couldn't figure
out any of the other undocumented symbols listed at the above URLs.  If you
can figure them out please let me know.   


> In[1]:=
> Developer`ContextFreeForm[aaa`x+bbb`y+z]
> 
> Out[1]=
> x+y+z
> 
> 
> In[2]:=
> Experimental`Infimum[11+6 x-10 x^2-5 x^3+2 x^4+x^5,-2<x<2,x]//InputForm
> 
> Out[2]=
> Root[-69847 - 171468*#1 - 129054*#1^2 - 24692*#1^3 + 3125*#1^4 & , 1]
> 
> --------------------
> Regards,
> Ted Ersek
> 
> Download Mathematica tips, tricks from
> http://www.verbeia.com/mathematica/tips/Tricks.html
> 


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