Stargates let you create an inter-connected portal system for fast travelling between two points. Creating a gate requires 8 diamond blocks and two beacons per gate. Travel is free, but you need to be at a gate to travel to another.
Gates can be on the central network or on their own private network.
Place the diamond and beacon blocks in the layout shown below:
To activate the gate, place a sign on the third row down (the middle line), on one of the sides.
Once you've finished the sign, your portal should activate.
To deactivate a gate, simply break one of the gate's blocks.
Right click the sign to choose a destination, and then click the button to activate the portal.