UCHAR
HalpGetRegistryCdromInformation(
  IN  PUCHAR CdromName
  );

Routine Description:

    This routine attempts to open the configuration registry key containing
    stick cdrom letter information and returns this information if present.

Arguments:

    CdromName - The ASCII string for the device in question.

Return Value:

    Zero if there is a problem or there is no stick letter assignment.
    The drive letter if there is an assignment.