For an easier usage, NEI and WAILA could be installed, which show the input and output on the Buffer Gate.
The Buffer Gate has one input side and three output sides for red alloy cables, redstone, an adjacent circuit, machine, lamp or anything that can be controlled with redstone signals.
If there is no redstone signal on the input side, then no redstone signal is emitted on the output sides. If a signal reaches the input side, then a signal is transmitted through the output sides.
Using the screwdriver from Project Red, the orientation of the gate can be changed freely in all four directions. Furthermore, using the screwdriver in crouching, the output sides can be turned off and on again in various combinations.