we are developing a web application who can, when the user press a button, open 2 or more new Internet Explorer windows to show pdf files. If the user as already open a pdf document in his Windows session, all works fine. But if no, the windows open correctly, but only the first show the pdf files. Others remains blank. I think the reason is that when the first window open, Adobe Reader plug-in must be loaded and the next windows don't wait and believe that Adobe Reader plug-in is already ready.