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From the Start menu go to Settings then Control Panel.
There are two sections Computer: and System:. Under Computer section is the Windows CE version number and under System section is the Processor Type.
Note: The graphics and menu arrangements may be different among various Win CE versions, but the general guide remains the same. On the more recent versions of Windows CE, the Processor Type information may not be completely on the screen, so you may need to copy the text and paste it to some other Windows that has a text field (such as the Run menu)