Limit register new account in an IP of existed account.
Some time you don't want 1 IP have 2 or more account in your website. You need to stop this problem. Do this tutorial
GO GO GO
1. Open file engine/module/register.php and find
if( $name == "" ) $stop .= $lang['reg_err_7'];
Below it add
$UserIP = $_SERVER['REMOTE_ADDR'];
    $fetch = $db->query( "SELECT name FROM " . USERPREFIX . "_users WHERE logged_ip = '$UserIP'" );
    $check = $db->get_row($fetch);
    if ($check) $stop .= "This IP was used to register another account in this site.";
    $fetch = $db->query( "SELECT name FROM " . USERPREFIX . "_users WHERE logged_ip = '$UserIP'" );
    $check = $db->get_row($fetch);
    if ($check) $stop .= "This IP was used to register another account in this site.";
2. Finish
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