File access and modification through a web site
<p>I want to access a file (a Microsoft Office file, e.g., Word, ppt, exl) through a web application and modify it and save it. The changes done for the file should be saved to a file location on the server.</p>

<p>If the file is accessed by another user, other users should be notified. (Just like SharePoint does.)</p>

<p>Please help me on this.</p>
