WP Single Login & Security is an easy way to protect your user account, it prevents
Simultaneous login & spam on wordpress, Auto logout user if user is inactive. Auto block I.P address if many failed login attemps. User I.P Address Whitelist wherein you can allow I.P address that can access the website.
WP Single login is ideal for wordpress members, which prevent user using there account simultaneous,
like for example giving there access to there friend,relatives etc. this plugin prevent thats.
its also ideal for wordpress shopping websites (eg. woocommerce) it can prevent user fraud account
and at the same time protect your customer account.
DEMO
http://www.plugins.codemywebapps.com/wp-admin/
User 1
username : user1
password : user1
User 2
username : user2
password : user2