INT 15 - DESQview v2.23+ - "PUTKEY" - FAKE USER KEYSTROKES
        AX = DE1Dh
        DX = segment of handle for task to receive keystroke
        BL = character
        BH = scan code
Return: AX = 0000h if successful
           nonzero if receiver's keyboard buffer was full
Notes:  the key is treated as though the user had pressed it, ignoring any
          script which may be bound to the key, and using the current field
          table if the keyboard object is in field processing mode
        multiple PUTKEYs are seen in the order in which they are executed