Ported to Drupal 7 by Ervin (ervindm as drupal.org community name) from 6.x-2.1 as code base 


Overview:
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The session-limit module is designed to allow an administrator to limit
the number of simultaneous sessions a user may have.

Installation and configuration:
-------------------------------
Installation is as simple as copying the module into your 'modules' directory,
then enabling the module at 'Administer >> Site building >> Modules'.

The default max sessions is 1. Change default max sessions can be changed in
'Administer >> User management >> Session limit'.

Triggers are available to assign any of the three system actions to either the
collision or disconnect events. That includes displaying a message to the user,
sending an email, or redirecting to a different URL.

Optional:
---------
This module is able to use the token module for generating tokenized emails
or showing tokenized messages on the collision and disconnect events.

http://drupal.org/project/token

If you want to customize the notices that users see, try the String Overrides
module. Both the message for prompting to disconnect a user and the message
that the disconnected user sees are passed through Drupal's localize t()
function.

http://drupal.org/project/stringoverrides

Requires:
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 - Drupal 7.X

Issue queue:
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http://drupal.org/project/issues/session_limit