Window Handlers

Due to a lack of reference material on my behalf, I'm having difficulty in implementing the following:

I wish to execute an installed application, say an instance of MS Internet Explorer, and return the window handle of the browser window it opens so that I may retrieve its coordinates, send commands such as maximise, setfocus, set the window size, retrieve the title bar contents, etc.

Additionally (or if the above is not possible) I want to be able to return the handles of all top level windows belonging to a running process eg "iexplore.exe". I've attempted using EnumWindows in conjunction with EnumWindowsProc, searching for handles based in title contents. I know its not the best solution, but I'd like to know where I went wrong since I always get stuck in an infinite loop. The code is as follows:

What I tried to do here is append the title of each window to a message box's contents. If it weren't for the counter to forcibly stop the process, it would simply loop infinately through the titles of each window over and over again.

I'm using Borland C++ Builder 5.

//--------------------------------------

TForm1 *Form1;

BOOL CALLBACK EnumWindowsProc(HWND hwnd, LPARAM lParam)
{
      char text[200];
      GetWindowText(hwnd,text,200);
      Form1->Memo1->Lines->Add(text);
      Form1->counter++;
      if (Form1->counter == 1000) return FALSE;
      return TRUE;
};

//--------------------------------------

void __fastcall TForm1::Button1Click(TObject *Sender)
{

      HWND hwnd;
      LPARAM lParam = 0;

    Form1->counter = 0;

      while(EnumWindows((WNDENUMPROC)EnumWindowsProc, lParam))
      {
            EnumWindowsProc(hwnd,lParam);
      }

}
//--------------------------------------


I would greatly appreciate code examples.