Jomres includes a feature to detect mobile devices such as cellphones and tablet PCs. If the feature (configurable in the Site Configuration -> Misc tab) is enabled then if a mobile device is detected Jomres will redirect the user to a view of Jomres that does not include the Joomla header, modules etc.

 

This view in Jomres is referred to as it's "management view" (historically only managers would be able to see this module-less view, but it's since been adapted for mobile devices) and is served by templates with "management" in their name.

 

If you are a plugin developer and want to know if Jomres has detected that a mobile device is in use, you can look at the value of the constant _JOMRES_MOBILE If it's true, then Jomres believes that it's being accessed through a mobile device (since Jomres v6.6.4).