|   |   | 
| $config.id Returns the ID of an open config file | 
| Usage | 
| $config.id(<filename>) | 
| Description | 
| Returns the ID of an open config file specified by <filename>. (This is the same ID that is returned by $config.open. If no such file is open, 0 is returned (that is an invalid config identifier). | 
| See also | 
| config module documentation |