It shows all of the commands for the plugins on your server. It also doesn't need to have a plugin to hook into it (unlike help 3)
I honestly have no idea how to do that, but I'll look inside the essentials source and see if I can figure it out tomorrow.
Try this: http://forums.bukkit.org/threads/info-help-3-a-smarter-help-953.13601/ And if you like it automated get this too: http://forums.bukkit.org/threads/info-autohelp-0-2-support-plugin-for-help-740-860.15474/
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