Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. MoWeS is a software from CH Software and stands for the abbreviation Modular Webserver System. MoWeS allows the user to start a fully-fledged webserver based on Apache, MySQL and PHP from a USB stick or any other writable medium without installation. MoWeS is free software and released under the GNU GPL. MoWeS Portable 2 is the current, stable release that allows one to set up a webserver as a portable application. Using the so-called MoWeS Mixer, an individual can create a custom package from different applications. All the packages are installed automatically without any user interaction and can be used immediately after MoWeS has started. The advantage for the users is that they do not need to install the applications themselves and, thus, also beginners have the ability to try different web applications. Since version 2.1.1 MoWeS Portable also includes a backup function: with one click a ZIP file of the whole webserver system is created. After version 2.1.1. to version 2.2.3 only minor features were added and bugs were fixed.