Loads an I/O driver into system memory so it can be used to handle
  device requests.

  Format:

   LOAD file-spec

  If the file-spec is the same as a driver already loaded (the name
  in the Driver Prologue Table is used for comparison), no load takes
  place.  If the driver is the same as a driver already loaded but the
  file specification is different, the specified driver replaces the
  existing driver.

  Requires CMKRNL privilege.

  Example:

    LOAD SYS$LOADABLE_IMAGES:XADRIVER