If you are not already familiar with the use of 3-way and 4-way switches, first read "Controlling lights with two or more switches." From that page, you know how to control a single light with as many switches as you want. To control multiple lights from these switches, just place additional lights in parallel with the first, as shown below. (The four-way switches are optional.)
The first light box has two 3-conductor cables coming from the neighboring switch boxes and a 2-conductor cable extending to the next light box.
In the first light box:
In the last light box, just connect the black and white wires to your light fixture.
A visitor to this page asked about whether one could rig up a multilight-multiswitch circuit without the branch shown above. You certainly can, by using 4-conductor cable. Here is the circuit:
Note that the blue wire is the switched hot, and the white wire is neutral. You may connect as many lights as you wish in parallel by this means. You must use 4-conductor cable from the first light to the last light. Caution: do not try to use a pair of two-conductor cables instead of the 4-conductor cable. This presents a very dangerous situation and is a violation of code. Finally, note that you many include as many 4-way switches on either side as you like, or you may include none at all. However, the 3-way switches must be at each end as shown.
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Controlling lights with multiple switches
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