This page is actually under construction The osg4web plugin Loading phase within a webpage is organized in two main steps: Shell loading Cores loading The first is the Firefox/IE "Shell" (Shell_npOSG4Web and Shell_ieOSG4Web VS projects) it takes care of all the windows handling, javascript connection, downloading and loading of different "Cores" that implement the actual OSG or OpenGL "applications". These are currently DLLs that are dinamically loaded according to values specified in the tag param defined in the calling html page. Eg: <param name="ADVCoreSHA1" value="CoreName"> <param name="ADVCore" value="http://Path/To/CoreName.rar"> This feature allow to deploy different applications with the same plugin installation. the second parameter is used to allow the download of a rar file if the DLL is not present as a pre-installed DLL with the current deployed plugin.