While ENVY provides an extensive toolset, tools and enhancements can make life easier for a developer or administrator. This section presents a few such tools, with example source code and explanations of the techniques involved. For full code, including complete source code for these tools, see the book's Web site. The tools we will look at are as follows:

1. ▪ A script manager, which organizes a collection of scripts inside user fields in the repository.

2. ▪ A three-way differences browser, which streamlines the process of merging two divergent streams together.

3. ▪ A simple project management tool to support the layered architecture described in Chapter 4.

4. ▪ A checkpointing facility, which creates versions of a component out of editions without modifying the underlying editions, tremendously simplifying backup, intermediate baselines, and management of multiple repositories. We think this is one of the most useful and important ENVY add-ons we've seen.

5. ▪ An integration of the Refactoring Browser facilities into the standard ENVY browsers.

6. ▪ A way to rename versions in the ENVY repository without creating new editions and versioning them.

7. ▪ Ways of removing source code from ENVY components so that we can deliver libraries to other developers without exposing all of our internal source code.

The material on concepts and on using these tools is appropriate for novice developers and administrators. The material on implementation techniques is very advanced in some areas and is primarily intended for power users and toolsmiths.