title: Eclipse IDE; Open in current window / instance?
body: <p>I've been using Eclipse for about a week now and I'm loving it.. great software for the 'price'. :P However, I'm having a few issues getting started.</p>
  
  <p>The most annoying, so far, has been opening files from outside of Eclipse, and having them set to open w/ Eclipse. When I open a file from the file-explorer or an external application (WinSCP for instance), Eclipse seemingly attempts to open an entirely new instance itself rather than opening the file within a currently running instance. Of course, because this is the case, Eclipse errors out w/ 'The workspace is currently in use. Please select another' (or whatever it says).</p>
  
  <p>Is there a configuration option, or an argument that I can use when opening a file externally that will simply use the currently open instance of Eclipse?</p>
  
  <p>Thx in advance! :)</p>