GMC Templates are preconfigured Mobile Entree applications that will be applied based on the SharePoint site template that was used.  The configuration of these templates is done in XML and Mobile Entree installs with templates for many of the default SharePoint site templates.

You can customize this XML file, which is installed at //TEMPLATE/IMAGES/EntreeServer/base/ME_SiteConfiguration_Template.xml, to include your own site templates or to change the default templates.

These templates are applied when a request is made on a site that has the Mobile Entree Base Feature activated, but no configuration data exists yet.  This allows you to staple the Mobile Entree Base Feature in your site templates for automatic mobile access.  For any existing site, you simply have to write a script to run through and activate the Mobile Entree Base Feature on each web. 

Here is an example of how to programmatically activate a feature: http://www.dotnetmafia.com/blogs/dotnettipoftheday/archive/2008/02/22/how-to-programmatically-activate-a-feature.aspx

The Mobile Entree Base Feature GUID is {f36740ac-c2ae-4630-a03e-064e923229f1}