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OR Gate contains information about the RedPower mod.
The output is on when any input is on. Holding shift and right-clicking with a Screwdriver or Sonic Screwdriver cycles through options to disable some inputs. Disabled inputs have no red in their groove; they can thus be distinguished from active inputs, which have bright red in their grooves. An OR Gate is generally only worth making if one is going to disable some inputs, since ordinary redstone or redwire otherwise have the same logical effect.