Int 21 Fn 2501  P - Phar Lap 386/dos-extender - Reset Dos Extender Data S  [E]

   AX = 2501h
   SS = application's original SS or DS (FlashTek X-32VM)

Return: CF clear if successful
   CF set on error
       caller is operating on X-32 stack (FlashTek X-32VM)

Notes: Phar Lap uses INT 21/AH=25h as the entry point for all 386/DOS-Extender
     system calls.  Only available when directly using 386/DOS-Extender or
     a compatible DOS extender, or when using a product that was created
     using 386-DOS/Extender or a compatible
   this function is also supported by FlashTek X-32VM

See Also: AH=30h"Phar Lap"