except for the following embedded DOS:

using windows exploder
try creating a directory or file with any of the following names

CON
PRN
AUX
NUL
COM1
COM2
COM3
COM4
COM5
COM6
COM7
COM8
COM9
LPT1
LPT2
LPT3
LPT4
LPT5
LPT6
LPT7
LPT8
LPT9

these are DOS reserved Port Names that were dragged into NT

or try using any of the following characters in Directory / File names

*
?
"
/
\
>
<
|
:

these are DOS reserved characters for File / Directory & Port handling
that were also dragged into NT

until I can have a File named:

</this is "my * file"\>.|?|

in the PRN directory

then there is still DOS in NT