In a nutshell... HFSLIP is an open source utility designed to update a Windows 2000, XP or 2003 installation source with the latest hotfixes. The binaries (individual files) of fully supported hotfixes are slipstreamed directly. This means that original files are being replaced with the newer versions present in the hotfix executables you can obtain from the Microsoft Download Center. In the rare occasion that a hotfix isnТ‘t supported (usually because of it being a non-standard package or requiring a special installation procedure), it is integrated instead. HFSLIP leaves these uncommon hotfixes or updates as they are and places them in the SVCPACK folder, to be installed automatically near the end of Windows setup. HFSLIP is also capable of slipstreaming: • select Service Packs (see SP slipstreaming for more info) • Windows Update Agent and Windows Genuine Advantage • Internet Explorer 6 and Outlook Express 6 (Windows 2000) • DirectX 9.0c (Windows 2000, Windows XP SP1 and Windows 2003) • Windows Media Player 9 (Windows 2000) • Windows Media Player 10 (Windows XP) • Windows Media Player 6.4 codecs (Windows 2000) • Windows Media 9/10 codecs (Windows 2000, XP and 2003) The HFSLIP project focuses on critical updates reported by the Windows Update or Microsoft Update web sites. However, all optional updates that show on those sites are currently supported.For experts and "advanced users" alike, HFSLIP offers additional features such as removing Internet Explorer from Windows 2000 (courtesy of Fred Vorck), reduction of your Windows source, individual source file replacement, codecs slipstreaming, support for "Application Addons", and many more.