LinkUpload in config do anything?

This section in the config file, does it do anything? I can only find any reference to LinkUpload inside the JS language files, no where else.

// Link Upload
FCKConfig.LinkUpload = false ;
FCKConfig.LinkUploadURL = FCKConfig.BasePath + "filemanager/upload/aspx/upload.aspx" ;
FCKConfig.LinkUploadWindowWidth = 300 ;
FCKConfig.LinkUploadWindowHeight = 150 ;
FCKConfig.LinkUploadAllowedExtensions = "*" ; // * or empty for all
FCKConfig.LinkUploadDeniedExtensions = ".exe .asp .php .aspx .js .cfm .dll" ; // empty for none