http://tech.groups.yahoo.com/group/power-pro/message/41170

showwindow.cc

// Activate window with specified title.
//

#include <iostream>
#include <windows.h>

using namespace std;

int main(int argc, char* argv[])
{
  if (argc < 2)
  {
    cout << "Usage: showwindow.exe <window_title>" << endl;
    return -1;
  }

  HWND target_hwnd = FindWindowA(NULL, argv[1]);
  if (!target_hwnd)
  {
    cout << "No window with specified title was found!" << endl;
    return -1;
  }

  if (GetForegroundWindow() != target_hwnd)
    SetForegroundWindow(target_hwnd);
}