In this context, 'slipstreaming' means integrating patches and updates (e.g., service pack 3) into an existing Windows XP installation CD. Service Pack 3, whether it is obtained through Windows Update, the 'network installation package,' or the ISO file, is a collection of updates and patches for an existing Windows XP installation. The difference between using Windows Update and either the 'network installation package' or the ISO file is that Windows Update will only download and install those updates and patches that are necessary for your particular installation of Windows XP.

The other two methods (which are essentially the same) include all updates and changes -- the decision about which ones to apply to your system is made during the update instead of before the download. That is why the Microsoft download pages advises not to use the 'network installation package' or the ISO file if you are updating just one computer -- you will likely be downloading more than you need. On the other hand, if you are responsible for updating many computers, it is more efficient to download the complete package only one time. Slipstreaming allows you to take an existing Windows XP installation CD that does not include service pack 3 and combine the material that is in service pack 3 to create a new CD that can be used to install Windows XP including service pack 3. ----- LemP Community Moderator MS MVP (Windows Desktop Experience) 2006-2009 Microsoft Community Contributor (MCC) 2011-2012. Doctor Who Mod.