Here's a quick tip on using mouse movement in the IPO Curve Editor to animate when working in Blender 2.49b or 2.5. Whether you're new to the Blender Foundation's popular 3D modeling program or a seasoned graphic artist just interested in better acquainting yourself with the application, you're sure to be well served by this free video tutorial. For more information, including detailed instructions, take a look.
Have an iPhone? Check out all 200+ new features coming in iOS 13.