The IsWebFarm setting is one of the AppSettings
that can be added to the web.config file. By default IsWebFarm is not included in the web.config and defaults to false. If your site is configured to use the FileBasedCachingProvider
and IsWebFarm is set to true, then the framework will ensure that all servers in the farm keep their caches in sync.
The IsWebFarm setting is not applicable if any caching provider other than FileBasedCachingProvider is used.
This setting replaces the EnableWebFarmSupport
setting that provided the same function in DotNetNuke 4.x.