Author: Udo Nesshoever 

How can I e.g. "type" programmatically in another application?

Answer:

There are several methods to send keystrokes or characters to a WinControl. The 
SetKeyboardState requires the control to have the focus but can send more (esp. 
special) keys. The use of WM_CHAR message enables you to send characters even to a 
hidden control unless you have found out the handle of it (there are a couple of 
ways to find out a controls handle). Once you've got it, you can send messages to 
it. 

I'm using this method for a little tool to "type" certain frequently used phrases 
while posting to newsgroups. 

I hardcoded the handle of the edit control of my favorite newsreader and now I have 
a small and handy tool to type messages faster than ever. 
1   
2   procedure SendMsg(const h: HWND; const s: string);
3   var
4     i: integer;
5   begin
6     if h = 0 then
7       Exit;
8     if Length(s) = 0 then
9       Exit;
10    for i := 1 to Length(s) do
11    begin
12      if Ord(s[i]) in [9, 13, 32..254] then
13        SendMessage(h, WM_CHAR, Ord(s[i]), 0);
14    end;
15  end;