WHS discs question

[daphatgrant]

I bought and opened up WHS recently and was presented with 4 discs. I'm trying to figure out what everything is.

I know that this is the OS disc

This is the disc that you run on comps that will be attached to the server (Backup etc.)

Does this restore files from the server to another computer? If so is this run from the comp that is being restored?

Not sure what this is, came outside of the case with the other 3 discs.

Thanks for the input, I know it might seem kind of trivial but I have been unable to find the answer elsewhere.