How to create multiple libraries in iTunes and iPhoto

Sure I'd often wondered how it kept the photos or iPhoto or iTunes music on external hard drives.
By default iTunes or iPhoto libraries are stored in the main hard drive, which means that increasingly have less disk space. Believe it or not there is a way to create new libraries of these programs so that music or photos are stored on external hard drives:
Both iTunes and iPhoto can create as many libraries as you want. When you open any of these programs, hold down the alt key, and opens a dialog that lets you create or select the library you want to use at that time.

A main library on an external hard drive with all the songs and pictures of all life, and a small library with favorite Mac's internal drive is your thing, quite comfortable and saves a lot of disk space.

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