Int 31 Fn FF03  P - Causeway - "getsel" - Allocate New Selector            [E]

   AX = FF03h

Return: CF clear if successful
       BX = new selector
   CF set on error

Note:  the new selector is initialized with a base address of 000000h, a limit
     of 0000h, and attributes read/write expand-up data

See Also: AX=FF04h,AX=FF05h,AX=FF06h