Bukkit

Create a circuit:

1. type /qc <circuit_type> (or /qc for a list of circuits)
2. Click on a sender with redstone - if you click an invalid sender, it will supply you with a list
3. Click as many receivers as you want (same as above)
4. (optional) type /qc <circuit_type> to change the next receiver you click
5. Type /qc done to complete the circuit
6. Now, whenever the sender is activated, the receiver will activate as well!

To edit a circuit:

1. Look at a sender.
2. type /qc edit
3. now you can do steps 3 to 5 from above.

To remove a receiver:

1. You have to be in "edit" mode (so during creation, or during /qc edit)
2. Hold redstone in your hand, sneak, and click on the receiver.
3. Now you can do /qc done, or add the receiver again (with other circuit type, for example)

Note - to destroy a circuit, break the sender/receiver - to abort a creation type /qc abort