Don't force a new window on users unless there is a very good reason to do so. Here are some reasons why you should not open links in a new window:
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Opening links in a new window is disrespectful to your visitors. If they want the link to open in a new window they'll do it themselves.
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Unless you warn them, they will expect the link to open in the current window.
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It resets the browsers back button which is highly used in navigation.
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A new broswer window adds to the taskbar giving the user even more programs on the taskbar.
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It confuses or disorientates visually impaired or novice web users.
The only time I would use a new window was on a form to link to Help for the form or for the Privacy Policy related to the form. That way when the user is completing the form they are not taken away from the form to read the help or privacy policy.
Accessibility, Usability
accessibility