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The same principle applies but how it operates depends on the brand and model of camera. eg
Canon 300D/350D/400D get plugged into the side: similar to your old one for manual control or an RS 232 serial cable with a 3.5mm pin (same as the manual one) that runs to your laptop/desktop to your camera control your exposures.
Canon 20D/30D/40D/ get plugged into the side: use an electronic bulb release that operates similar to the manual one except you can control your exposures similar to the computer control but without the computer.
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