The class DNNLibraryComponentsSkinsSkin.vb (and some others) call DotNetNuke.Common.Globals.IsAdminControl() function.
There is no description in the function, and the code has too many negatives, that it is not obvious.
Once I figured it out, I decided to write it here.
The function returns True, if QueryString has “MID“ or “CTL“ parameter.
I am not fully understand, why it means an Admin contol.
There is some clarification in the document: http://www.yourephotostore.com/LinkClick.aspx?link=SSL_ModuleV3.pdf&mid=488
When a page is called with a query string parameter of “ctl”, “mid” or “def” a different module loading procedure is called in the skin.vb module. These three parameters are used to define exactly what module/controlis to be loaded. This only loads the ONE module defined in parameters. Because the page can be called without changing the tabID, there is no way to get to this page to add the module. This may seem a little contrary to initial impressions of how DotNetNuke works,
but this is the way that module configuration edit routines are called. For example, when you go to the configuration screen for this module, look at the URL, you will see that it has the same tabID value from the calling page.
I am not sure where “def“ parameter is used.
DotNetNuke.UI.Skins.Skin.Page_Init method calls IsAdminControl() and if it is true, loads only specified by “ctl” or “mid” module.