Int 15 Fn 40  - System - Read/modify Profiles (convertible)                [B]

   AH = 40h
   AL = subfunction
       00h get system profile in CX and BX
       01h set system profile from CX and BX
       02h get internal modem profile in BX
       03h set internal modem profile from BX

Return: CF clear if successful
       AH = 00h
   CF set on error
       AH = status (80h = profile execution failed)