How to call UMDF driver from App

Question

Hi MSFT team,

I have a question about UMDF, need your help to comments, Thanks.

Background:

• We want to dev a UMD driver (using UMDF2),
• We want to use an App to call this UM driver.

Question:

• The only interface the UDM exposed to App is via Win32 file I/O function, such as CreateFile, ReadFileEx, CancelIoEx, or DeviceIoControl, am I right?
• Any possible that app can call the UMD directly, not via Win32 file I/O functions.