1.These are used to edit pictures automatically.
2.These were made in Photoshop CS3, so I think that's all they'll work in.
3.You don't have to give any credit, but comment if you're using so I know to make more, and don't redistribute them.
4.Click the preview to download the action. Then you open an image in photoshop, click the play button near the color swatches, load the options, select the action you want to use, and click the play button at the bottom of the action window.