use Win32::GuiTest qw(FindWindowLike GetWindowText 
    SetForegroundWindow SendKeys);

  $Win32::GuiTest::debug = 0; # Set to "1" to enable verbose mode

  my @windows = FindWindowLike(0, "^Microsoft Excel", "^XLMAIN\$");
  for (@windows) {
      print "$_>\t'", GetWindowText($_), "'\n";
      SetForegroundWindow($_);
      SendKeys("%fn~a{TAB}b{TAB}{BS}{DOWN}");
  }