DOE CODE: Sharing research software between national institutes

I often enjoy thinking about how much software has changed our lives, how much software exists in the world, and how much is being written. I also like to consider how quickly the rate at which we write software is changing and the implications that this has for society. This is especially important for science where publications tend to summarize work done from a specific perspective but the real record of the work may be the software itself. What do we really do today to preserve and, if you will, curate collections of software, especially scientific software and the business software that supports science?