Windows NT DDK: ZwFsControlFile and other Zw functions?

Some Windows NT (not from Microsoft) drivers contain
calls of undocumented in NT4.0 DDK functions.
ZwFsControlFile is only one of them.
Do anybody knows if any documentation on this subject is available, or it even doesn't worth to try to find it?
Thank you in advance,
Who is Participating?
amartin030297Connect With a Mentor Commented:
ZW file control is the kernel mode version for file I/O
(ZwCreateFile/ZwWrite/ZwRead/etc)..  They are VERY important
functions and are part of Windows NT, Memphis, etc.. and they
are documented with the WDM documentation (provided you are
under NDA w/M$).
  And YES its worth finding more about if your writing drivers.

FrolovAuthor Commented:
Dear Aaron,

Thank you for your answer on my question. I'd like to grade your
answer as Excellent, the only things remains not very clear for
me (excuse me if I don't know may be so obvious terms).

You wrote:
"they are documented with the WDM documentation (provided you are
under NDA w/M$)."

Could you be so pleased to clarify what is:
a) WDM ?
b) NDA (Non Disclosure Agreement?)
c) w/M$ (without much money?)
d) How to start with getting this WDM?

Thank you again,

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