|   |   | 
| $config.readonly Checks whether a config file is opened in read-only mode | 
| Usage | 
| $config.readonly(<id>) | 
| Description | 
| Returns 1 if the config file identified by <id> is opened in read-only mode,
and 0 otherwise. <id> must be a valid config identifier returned by $config.open() If <id> does not identify an open config file, a warning is printed and 0 is returned. | 
| See also | 
| config module documentation |