st: SAS libname equivalent

["Jason A. Thompson" <jat@northwestern.edu>]

What is the correct way in Stata to establish pointers to paths in Windows 
XP, something along the lines of the LIBNAME and FILENAME statements in 
SAS? Can this be done using Windows environment variables? Can it be done 
without? Can it be done at all?! I've found the ability to do this in other 
environments critical to maintaining shared code.

Many thanks,
Jason

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