ulFlags (ULONG) - input

Only one of the following flags can be set:

MMIO_INSTALLPROC

Installs an I/O procedure with the entry point specified in the pIOProc parameter and the FOURCC in the fccIOProc parameter.
MMIO_REMOVEPROC
Removes an I/O procedure (that has the FOURCC specified in the fccIOProc parameter) from the table of installed I/O procedures.
MMIO_FINDPROC
Finds a previously installed I/O procedure with the identifier with the FOURCC specified in the fccIOProc parameter.

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