Flex cannot access that kind of information about the operating system.
You'll need to pass that information into your app via some other method.
Flashvars are probably not ideal since flashvars are only loaded when the
flex app is loaded. You'd be better off passing that kind of info in via a
service call to your server.
Thanks Codeflayer. That's what I presumed - I guess it would be a security risk otherwise - but thanks for the clarification.
No problem. Good luck with your app.