The files shared on computer A would show on computer B and C network drive but would only be on computer A so if you went out range with the computer C say laptop then you would not be able to get at the files .
If you want files on all computers not just in a share folder then maybe look at synchronizes files and folders between locations.
a quick google came up with this
http://www.microsoft.com/en-us/downl....aspx?id=15155