Send Message to Background window

["Manoj"]

hi experts
keybd_event function is used to send keys to an active windows.
If windows is not active then keys are not sent.
I have tried to use following functions to activate the window
SetFocus(handle of window)
SetActiveWindow(handle of window)
EnableWindow(handle of window)

But these don't make the window active.
Can someone tell me.
I have handle of window to which i want to send keys.
If window is enable then key are sent. But if it's not enable then keys are
not sent.
Please reply
Thanks