C:\test>md newdir
C:\test>cd newdir
C:\test\newdir>echo . > NIL

C:\test\newdir>dir
30/07/2012  21:06    <DIR>          .
30/07/2012  21:06    <DIR>          ..
30/07/2012  21:06                 4 NIL
               1 File(s)              4 bytes
               2 Dir(s)  101,782,999,040 bytes free

C:\test\newdir>echo . > NUL
C:\test\newdir>echo . > nul
C:\test\newdir>echo . > NuL
C:\test\newdir>echo . > ./../newdir/nul
C:\test\newdir>echo . > nulpoint
C:\test\newdir>echo . > nul.txt
C:\test\newdir>echo . > nul.exe
C:\test\newdir>echo . > c:\test\newdir\nul.1231243345345
C:\test\newdir>dir
 Volume in drive C has no label.
 Volume Serial Number is 8C78-4B42

 Directory of C:\test\newdir

30/07/2012  21:07    <DIR>          .
30/07/2012  21:07    <DIR>          ..
30/07/2012  21:06                 4 NIL
30/07/2012  21:07                 4 nulpoint
               2 File(s)              8 bytes
               2 Dir(s)  101,783,220,224 bytes free