What is it?
This plugin allows server administrators to host Beta 1.7.3 servers which do not have working authentication servers.
How does it work?
The plugin is very simple actually. The plugin when a player joins will take note of the IP which they have joined with. From this their username and IP will be locked too each other. This means that you MUST connect from the same IP as you did the first time in order to use the account. If you do not you will be kicked for a custom reason which can be set in the config.
What happens if someone logs into my account while I am online?
The plugin overrides Bukkit and cancels the kick event which would have kicked you for the dreaded "Logged in from another location". From there it will kick the player who just attempted too log into the server for a custom reason which can be set in the config.