title: How to determine if a webserver is running Linux or Windows?
body: <p>I've been asked to find out if a particular site is running Windows or Linux as its webserver - usually we'd have access and I would just upload a phpinfo file and that would give me all the relevant information I need - however we've not been able to get access to FTP details yet.</p>
  
  <p>Is there a simple method using a Firefox plugin like Web Developer Toolbar that will indicate if the server is running Windows/Linux etc?</p>