What does RTW mean in Internet Explorer RTW?
In the context of Microsoft products, RTW is an oft used acronym that stands for Release to Web. In other words, made generally available for download.
Microsoft SDL (Phase 5) http://msdn.microsoft.com/en-us/library/cc307420.aspx
Internet Explorer 8 OEM Page http://www.microsoft.com/oem/en/products/other/pages/internet_explorer_overview.aspx