Int 67 Fn EF  - Rm386 V6.00+ - Execute XMS Function                        [m]

   AH = EFh
   AL = function (00h-12h,80h-8Fh)
   other register as appropriate for XMS function

Return: varies by function (see INT 2F/AX=4310h)

Note:  these functions appear to be equivalent to the XMS functions with the
     same numbers

See Also: AH=5Dh"RM386",INT 2F/AX=4310h