Calling MRxLowIOSubmit[LOWIO_OP_IOCTL] routine in RDBSS

How does a service invoke the driver’s linked with RDBSS MRxLowIOSubmit[LOWIO_OP_IOCTL] routine? I require this to perform overlapped IO since RDBSS documenation says “RDBSS assumes that all routines implemented by a network mini-redirector other than the low I/O and connection-related routines are based on synchronous calls. However, this is subject to change in future releases of the Windows operating system.”

Thanks again,
Matthew