There are a few different ways that you can "access" a kernel mode driver. The most obvious in this case would be to use the ioctl interface.
Unfortunately, I can't provide you with an example, because to achieve that would require me to install the Windows DDK on my virtual machine, along with actually writing the code for it.
There is, however, an article here which explains how ioctls in filter drivers work.
From your application, you need to use DeviceIoControl
.