Int 21 Fn 5FCA  - Lantastic V4.0+ - Stuff Server Keyboard Buffer           [N]

   AX = 5FCAh
   ES:DI -> ASCIZ server name in form "\\machine"
   DS:SI -> ASCIZ string to stuff (128 bytes)

Return: CF clear if successful
   CF set on error
       AX = error code

Note:  you must have the "S" privilege to use this call
   maximum number of characters that can be stuffed is determined by the
     server's RUN BUFFER SIZE.

See Also: INT 16/AH=05h