n is either 1 (true) or 0 (false). The default value is 1.
When AsynchError is enabled (n = 1), InterSystems IRIS® data platform processes can receive asynchronous errors.
Changing This Parameter
On the Compatibility page of the Management Portal (System Administration > Configuration > Additional Settings > Compatibility), in the AsynchError row, click Edit. Select AsynchError to enable this setting.
Instead of using the Management Portal, you can change AsynchError in the Config.Miscellanous class (as described in the class reference) or by editing the CPF in a text editor (as described in the Editing the Active CPF section of the “Introduction to the Configuration Parameter File” chapter in this book).