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I want to allow only one session at the time across browsers and PCs. I want to "disconect" or log out to the old session if a new session starts in Wordpress.

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WordPress doesn't use sessions, it uses cookies. – Wyck Feb 3 '13 at 17:10
Using cookies exist a way? – Jesus L. Feb 3 '13 at 18:14

You can do this by changing LOGGED_IN_KEY constant in your wp-config.php before logging in.

define('AUTH_KEY', 'put your unique phrase here');

Update: it's better to invalidate all secret keys. They can be generated by Wordpress own generator here: https://api.wordpress.org/secret-key/1.1/

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This does not answer the question. – Chris_O Feb 3 '13 at 8:35
@Chris_O, really? > You can change these at any point in time to invalidate all existing cookies. This does mean that all users will have to login again. codex.wordpress.org/Editing_wp-config.php#Security_Keys – Max Yudin Feb 3 '13 at 9:13

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