Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Xenocode is a set of application virtualization and portable application creation technologies developed by Code Systems Corporation. Applications are packed into single executable files that can be executed instantly on any Windows desktop (so called "portable apps"). The technology therefore emulates only the operation system features that are necessary for the application to run. Applications can be deployed using existing infrastructure, software deployment tools, the web or USB keys. The virtualized application runs independently from other software that is installed on the host PC so there are no conflicts between different versions or DLL files. The virtualized applications can be used on different Windows operating systems (Windows 2000, Windows XP, Windows Vista and Windows 7).