Not all messages allowed by OS to be send between different
applications. You have to use
::PostMessage(HWND_BROADCAST,msg,wparam,lparam) and wait for similar
reply from you target box.
For messages allowed see help around WM_APP keyword. I tried to copy
part of that help here. See also UINT RegisterWindowMessage(
  LPCTSTR lpString // message string
);
Seva

The WM_APP constant is used by applications to help define private
messages, usually of the form WM_APP+X, where X is an integer value.

#define WM_APP 0x8000
Remarks
The WM_APP constant is used to distinguish between message values that
are reserved for use by the system and values that can be used by an
application to send messages within a private window class. The
following are the ranges of message numbers available.

Range Meaning
0 through WM_USER - 1 Messages reserved for use by the system.
WM_USER through 0x7FFF Integer messages for use by private window
classes.
WM_APP through 0xBFFF Messages available for use by applications.
0xC000 through 0xFFFF String messages for use by applications.
Greater than 0xFFFF Reserved by the system for future use.

Message numbers in the first range (0 through WM_USER - 1) are defined
by the system. Values in this range that are not explicitly defined are
reserved for future use by the system.

Message numbers in the second range (WM_USER through 0x7FFF) can be
defined and used by an application to send messages within a private
window class. These values cannot be used to define messages that are
meaningful throughout an application, because some predefined window
classes already define values in this range. For example, predefined
control classes such as BUTTON, EDIT, LISTBOX, and COMBOBOX may use
these values. Messages in this range should not be sent to other
applications unless the applications have been designed to exchange
messages and to attach the same meaning to the message numbers.

Message numbers in the third range (0x8000 through 0xBFFF) are available
for application to use as private messages. Message in this range do not
conflict with system messages.

Message numbers in the fourth range (0xC000 through 0xFFFF) are defined
at run time when an application calls the RegisterWindowMessage function
to retrieve a message number for a string. All applications that
register the same string can use the associated message number for
exchanging messages. The actual message number, however, is not a
constant and cannot be assumed to be the same between different
sessions.

Message numbers in the fifth range (greater than 0xFFFF) are reserved
for future use by the system.

Requirements
  Windows NT/2000: Requires Windows NT 3.51 or later.
  Windows 95/98: Requires Windows 95 or later.
  Header: Declared in Winuser.h; include Windows.h.

-----Original Message-----
From: Kuruvilla Jacob [mailto:jacob_kuHOTMAIL.COM]
Sent: Friday, November 23, 2001 5:55 AM
To: DCOMDISCUSS.MICROSOFT.COM
Subject: Sending key strokes to another App

Hi,
I have an windows application that pops up a message box with an ok
cancel
buttons.
Now, from another application I want to be able to send a message to
click
either the ok or the cancel button.

I have been able to get the Handle to the Messagebox window(and also the
handle to the command button having the "OK".) But when I do a
SendMessage(hWnd,WM_CHAR,VK_RETURN,0) nothing happens.

On the other hand if I do a SendMessage(hWnd,WM_CLOSE,0,0) I am able to
close the message box.
I have tried SendMessage(hWnd,WM_COMMAND,WM_LBUTTONDOWN,0) , but no
luck.

I would appreciate any help. The application to which I am sending these
messages to is a vendor application.

This is what I do.

hWindow = FindWindow(vbNullString, "Starquote NG")
hChildWindow = GetWindow(hWindow, 5)
lngReturnValue = SendMessage(hChildWindow, 7, 0, 0) ' Set focus
lngReturnValue = SendMessage(hChildWindow, WM_CHAR, 13, 0)
lngReturnValue = SendMessage(hChildWindow, WM_COMMAND, WM_LBUTTONDOWN,
0)

Thanks
Jacob

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