DECset for OpenVMS VAX and OpenVMS Alpha is a set of layered products
  that supports software developers' coding, debugging, testing, and
  maintenance activities.  These layered products are:

       Code Management System (CMS) -- provides an efficient method for
       storing project files and tracking all changes to those files.
       CMS stores any kind of file including documents, plans,
       specifications, status reports, source code files, object files,
       executable images, sixel files and other kinds of files.

       Language-Sensitive Editor (LSE) -- assists in developing
       programs faster. LSE is a multilanguage programmer's editor.
       LSE allows users to efficiently edit, compile, review diagnostic
       information from compilations, and correct compile time errors
       without exiting the editor.

       Module Management System (MMS) -- automates and simplifies
       the building of software applications.  MMS can optimize the
       build process by rebuilding only those components that have
       changed since the system was last built.

       Performance and Coverage Analyzer (PCA) -- helps users pinpoint
       execution bottlenecks in application programs.  PCA can also
       identify which parts of an application are not executed by a
       given set of test data.

       Source Code Analyzer (SCA) -- aids programmers in understanding
       the complexities of software systems.  SCA allows users to
       analyze an entire system, as opposed to individual components,
       and helps users understand unfamiliar systems.

       Digital Test Manager (DTM) -- automates the creation and
       maintenance of regression tests.  DTM also automatically
       compares  test run results with expected test results.

       DECset Environment Manager -- provides a single mechanism for
       tailoring the execution environment for a set of DECset tools.
       The Environment Manager is used to define and switch between
       software development activities in the DECset environment.

  The products in the DECset environment can be used in either a
  workstation or character-cell terminal environment.  All DECset
  components include both DECwindows Motif and command-line interfaces.