code: public void scanNode(SiteNode node, boolean incPort, User user) {
   		log.debug("scanNode" + prefix + " node=" + node.getNodeName());
  		this.setTabFocus();
  		nodeSelected(node, incPort);
  		if (currentSite != null && this.getStartScanButton().isEnabled()) {
  			startScan(node, false, false, null, user);
  		}
  	}
docs: Scans a node (URL). If a User is specified, the scan should be done from the point of view of
  the user.
  
  @param node the node
  @param incPort the inc port
  @param user the user