I switched from the windows 2000 machine to a windows 98 machine, and the same phenomenon
with the /tmp and /usr directories occurs:
$ mkdir usr
mkdir: cannot create directory 'usr': File exists
$ cd usr
$ ls usr (lists contents of "/" directory)
$ cd /
$ mkdir tmp
$ cd tmp
$ ls tmp (lists contents of C:\Windows\Temp )
This happens in msys, but not in cygwin.
Steve Gallo
Stockton, California