OverrideMode
Specifies the override behavior of a configuration element for configuration elements in child directories.
Allow = 1
The configuration setting of the element or group can be overridden by configuration settings that are in child directories.
Deny = 2
The configuration setting of the element or group cannot be overridden by configuration settings that are in child directories.
Inherit = 0
The configuration setting of the element or group will be overridden by configuration settings that are in child directories if explicitly allowed by a parent element of the current configuration element or group. Permission to override is specified by using the OverrideMode attribute.