Installation Using RIS
RIS can be used only for clean installations and cannot be used to upgrade a previous version of Windows. A RIPrep image can contain the operating system and applications. Computers that are connected to the same network as the server, and have been enabled, automatically start the RIS sequence.
This process can be automated through what is called Remote Replication. Remote replication allows installations to be sent to a designated network share at a remote office, which can then be run by any system at that location. This allows servers to run the install automatically, eliminating the need for dedicated hardware or personnel at each facility. The primary benefit of remote replication is reduced cost and complexity of managing multi-site organizations.
Read more about this topic: Remote Installation Services