How Different is Windows Embedded Standard 7 (WES7) from Windows 7?

With the exception of games(sorry no solitaire) and sample media, Windows Embedded Standard 7 includes the same functionality as Windows 7 Ultimate. However, WES7 includes a number of technologies not found in desktop version of Windows. These are known as the Embedded Enabling Features(EEFs) and include a number of technologies that make the operating system suitable for embedded applications.

Can I Make Permanent Changes to the System?

Since the first Windows Embedded operating system based on a desktop version, a technology set called "Write Filters" has been included. Write filters are an Embedded Enabling Feature and provide the ability for the operating system and all applications to run in a read only mode, meaning that by default no changes are made to the protected disk. By design, when the system is restarted, all changes made to the system and files are lost and the system returns to its original state. Since the Write Filter Operation is only applicable when the Windows Embedded Standard OS is running, changes can be made to the system in an "offline" manner when the system drive is accessed from another system. Optionally permanent changes can also be made to the system when the system is running through a number of provided utilities and a programming API and custom written software.

How to Activate and Purchase Licensing for WES7?

Licensing is provided by authorised Windows Embedded distributors that are dedicated to the supply of tools and licenses to companies building embedded and dedicated devices.
There is no activation of any kind and the relevant license information and number (PID) can be used for miltiple units. The information can also be included in the development tool Image Configuration Editor to eliminiate another step in the installation process.