Simply by holding a key (item) as you go through a nether portal, you can now travel to worlds previously inaccessible without a multiple world management plugin. To use this plugin, an admin/op/server staff member must designate an item to be a key and the world that it opens. So far, the commands and permissions are pretty simple:
Commands and Permissions
/pk the base command. Shows information about the other commands
/pk keys lists all available keys.
no permission node required
/pk set <key> <destination> sets the world for the specified item. Currently, items have to be specified with item IDs.
/pk del <key> deletes the specified key from the list. works similarly to /pk set
portalkey.set
To use a specific key, you need the permission node portalkey.use.<ItemID>
The permission node portalkey.use.all will allow you to use any key.
To grant someone access to all permission nodes of portalkey, you can use the node portalkey.op