Part of the new CF11 mobile development features. This tag is similar to cfprocessingdirective and acts as a compiler directive to include plugins for various features (device detection and device API). You can use this tag to load all the required device detection plugins.
<cfclientsettings enableDeviceAPI = "true|false" detectDevice = "true|false" deviceTimeout = Number >
cfclientsettings(enableDeviceAPI = "true|false", detectDevice = "true|false", deviceTimeout = Number);