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Rationel WindowsDesignerTM Welcome to Rationel WindowsDesignerTM. This site lets your imagination run free. See your new windows in your own house before you buy them. Which colour will suit your home best? Why not try our software to find out.

New user? If you have not used Rationel WindowsDesignerTM before choose the link below: Go to Rationel WindowsDesignerTM

Existing user? Username: Password: Remember login: Have you forgotten your login? Get your password sent again - click here.