UMDF Infrastructure
From the perspective of the Windows I/O manager, the target of an I/O request must be a WDM device object. These objects reside in the kernel-mode address space and are not accessible to user-mode drivers. A key requirement for UMDF is a secure way to bridge the gap between user mode and kernel mode and to deliver the I/O requests to a user-mode driver. This requirement is handled by the following major elements of the UMDF infrastructure:
A kernel-mode driver—called the reflector—that represents UMDF drivers in the kernel-mode part of the device stack. The reflector manages communication to and from the UMDF host process, which runs in user mode.
A communication mechanism that allows requests to be sent across the user-mode/kernel-mode ...
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