A design problem related to drivers and/or application (single instance)

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Hi all,

I am building a driver (lets name it A) which is to be used by different
applications. The design constraints are such that there will be only one
instance of A which will be accessed by all the applications using it and
this is the only reason because of which I am making it a kernel level
driver. From this A, I have to open another kernel level driver (lets name
it B) using CreateFile() and I have to send some IO controls to B using
DeviceIoControl(). Is it possible for me to open B from A if A it is a
kernel-mode driver? And if yes then can I use normal functions like
CreateFile() and DeviceIoControl() or do I have to rely on some other
functions?

If its not possible for a kernel level driver to open another kernel level
driver then is it possible that I could make A a user-mode driver instead of
kernel-mode driver? and if yes how can I do this?

If its not possible for me to develop A as a user-mode driver then what
other approaches I can use so that there will be only one instance of A that
will be used by all the client applications.

I am using WinXP.

Thanks,

Arsalan



.

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