code: public static synchronized boolean removeDenyID(String id) {
  		if(deniedID!=null && deniedID.remove(id)!=null) { 
  			writeID();
  			if(deniedID.isEmpty()) {
  				deniedID=null;
  			}
  
  			return true;
  		}
  		return false;
  	}
docs: Return of "True" means ID has was removed.
  Return of "False" means ID wasn't being denied.
  
  @param ip
  @return