HOWTO switch off back light of 1 from N monitors ?

As I learned here:

http://social.msdn.microsoft.com/Forums/en-US/vcgeneral/thread/d2f6d4be-dcf0-4de2-94ef-5d46c426951a

The backlight of a panel can be switched on/off by sending the

      >> WM_SYSCOMMAND with paramter wPAram=SC_MONITORPOWER and ... <<

message.

Now I have connected several monitors to my test computer. When sending the "back-ligt-on/off message" the backlights of all connected monitors are switched on/off.

Unlike this, the brightness function call

BOOL SetMonitorBrightness(
  __in  HANDLE hMonitor,
  __in  DWORD dwNewBrightness
);

allows to select a single monitor, that I can modify.

==> Does in the "back light on/off-control-message", also exist a possibility, to switch offonly the back light of one special monitor( the back light of the other monitor(s) should not change his state).

-   If yes, how can I do that?