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User CLient For Third Party Driver



Hello,
 Can we write a "User Client "  in kernel space for a third party driver eg
 nvidia graphics driver.
           or we have to write a graphics driver along with the user client.

    What we have noticed is that in Simple User Client Sample code ,   if we
change the name of KMyDriverIOKitClassName from com_apple_dts_simpledriver
to ATIRadeon8500 ie class of already loaded kext , then user client  fails
to open the resultant kext .

Does this implies that we have to write a driver along with the  user client
then only user client will succeed..  As such user client hs no independent
entity.
When I debugged the Sample Code Kext file I found user clients function in
the kext file..Does it implies that user client is compiled as part of
driver and is included in the resultant kext.
Can we make an independent  User Client as a kext file.
I think user client can be build only along with a sriver to which it will
serve as a client.

                                Thanking You


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