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 comaparison), 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.

Example
    LOAD SYS$SYSTEM:XADRIVER

                CMKRNL privilege required