Int 21 Fn DF07  - Software Carousel - Send Command To Memory Section       [T]

   AX = DF07h
   BL = task number
   CX = length of command (max 8 chars)
   DS:SI -> command line

Return: AL = status
       00h Carousel not running
       01h successful
       FFh unsucessful
       AH = error code (01h,06h) (see AX=DF01h)

Note:  the maximum length seems too small and may be a typo for 80 characters