Called by the framework to get the name of the DLL containing the add-in functions when they are registered
virtual std::tstring GetDllName( );
This method is called whenever the functions contained in a DLL are registered with Excel as add-in functions.
You can use it to override the name provided to Excel, when the XLL containing the functions has been loaded by a boot-strap XLL.
The default implementation of this function returns the name of the XLL loaded by Excel (whether using the Excel Tools - Add-ins dialog or directly, using the File - Open menu option).