Plugin Tag፥ single login
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Wp Single Login
Using wp single login you can easily add the functionality to allow only single login per user.
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WP One Login
WP One Login , to prevent users from login to your site from different devices at a time.
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Single Sign-On – Professional SSO solution for WordPress
Single Sign-On is a professional SSO extension that works accross different domains, servers and websites. Installed in just a few minutes.