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Just type some text. The text is valid if it equals "wilco". If you type a string shorter than 5 chars, an error message will say so. If it is more than 10 chars, it will display a diff. error message. Anything else is invalid too, except that the default error message will be displayed. Validation happens server-side, which means you don't have to implement validation twice.
Currently, the control can only do client-side validation in IE-based browsers. This is due to the limitation of the current ASP.NET 2.0 framework's validation script, which contains some things which are invalid in firefox (like using a variable 'final', which is appearently a reserved keyword).