Browsing French translation

1695.

So suppose you're running version 1 of some application, and you want to upgrade to version 2. You shut down the program, giving you a .tap file that you could restore with twistd to get back to the same state that you had before. The upgrade process is to then install the new version of the application, and then use twistd to launch the saved .tap file. The old data will be loaded into classes created with the new code, and now you'll have a program running with the new behavior but the old data.