Int 21 Fn 8D  - European MS-dos 4.0 - Send Signal                          [D]

   AH = 8Dh
   AL = signal number (see AH=8Ch)
   BH = signal argument
   BL = action
       00h send to entire command subtree
       01h send only to specified process
   DX = Process ID

Return: CF clear if successful
   CF set on error
       AX = error code (01h,06h)(see AH=59h)
Desc:  invoke the exceptional-condition handler for the specified process

Note:  error 06h may be returned if one or more of the affected processes
     have an error handler for the signal

See Also: AH=8Ch