fccIOProc (FOURCC) - input

      The four-character code of the I/O procedure to install, remove, or search for.

    pIOProc (PMMIOPROC) - input

      If this function is being called to install an I/O procedure, then pIOProc must contain the address of the I/O procedure entry point. Otherwise, pIOProc must be NULL.

    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.

      rc (PMMIOPROC) - returns

        Upon successful completion, this function returns the address of the I/O procedure that was installed, removed, or searched for. If a failure occurs, NULL is returned.

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