Int 21 Fn 8402  - European Ms-dos 4.0 - "releasemem" - Free Shared Memory  [D]

   AX = 8402h
   BX = handle (segment address of shared memory object)

Return: CF clear if successful
   CF set on error
       AX = error code (no such name)
Desc:  indicate that the specified area of shared memory will no longer be
     used by the caller

Note:  the reference count is decremented and the shared memory area is
     deallocated if the new reference count is zero

See Also: AX=8400h,AX=8401h,INT 15/AX=DE19h