Does Stata give up certain commands?

I use Stata 12 by reading a book on Stata 11 and the Internet. I would like to use two commands: wincorr and grqreg. None of them works.

Do you know how to do simply winsorising with Stata?

More importantly, how to display graph of coefficients over quantiles, when you have done quantile regressions? (problem with grqreg command)

Thanks for your time and your expertise.
Have a nice day


PS: sorry for my level in English... I'm French.