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      May 1999

      Thank you for purchasing the DEC Ada Version 3.5 Professional
      Development Option (PDO), which includes the following features
      and capabilities:

      o  Smart recompilation

         Can significantly reduce the number of recompilations that
         are needed to rebuild your program after some compilation
         units change. Smart recompilation allows the compiler to
         propagate changes quickly through a system, eliminating up to
         100% of the usual recompilations.

      o  Program library file-block caching

         Minimizes the actual amount of disk input-output that must
         be performed by using an in-memory cache of file blocks from
         files in the Ada library. As a result of file-block caching,
         the elapsed time for compilations is significantly reduced.

      o  Multilevel program library directory structure

         Provides a more efficient program library directory struc-
         ture to improve the performance of access to large program
         libraries.

      All of the features and capabilities are designed so that you
      do not need to change your current development procedures or
      source code when you enable the PDO. You can use your currently
      existing programs without any special linkers or loaders.

      For additional information about the DEC Ada Version 3.5 Pro-
      fessional Development Option, see Developing Ada Programs on
      OpenVMS Systems.

                                    NOTE

         Compaq Ada was formerly known as DEC Ada. References to
         DEC Ada in product components should be construed as ref-
         erences to Compaq Ada.

      There are three kinds of licenses for the Professional Develop-
      ment Option:

      o  Unlimited License-Allocates license units on an unlimited
         system use basis

      o  Personal Use License-Lets one identified individual use the
         layered product

      o  Concurrent Use License-Lets any one process at a time use the
         layered product

      Follow these steps when you are ready to install the PDO:

      1. First install DEC Ada, using the License Management Facility
         (LMF) to register the License Product Authorization Key
         (License PAK) for DEC Ada Version 3.5 for OpenVMS Alpha
         Systems. The DEC Ada Version 3.5 Professional Development

 






         Option software is a separately licensed part of the kit
         containing DEC Ada.

      2. Use LMF to register the License PAK for the DEC Ada Version
         3.5 Professional Development Option. The License PAK for the
         PDO is shipped with the DEC Ada kit if you ordered DEC Ada
         and the Professional Development Option together. Otherwise,
         it is shipped separately to a location based on your license
         order.

      See the OpenVMS License Management Utility Manual for registra-
      tion instructions.

      Documentation

      Complete documentation of the DEC Ada Version 3.5 Professional
      Development Option appears in Chapter 5 and in Appendix A of
      Developing Ada Programs on OpenVMS Systems (order number: AA-
      PWGYA-TK).

      DIGITAL Services

      A variety of service and support options are available from
      DIGITAL. For more information, contact your local DIGITAL sales
      office.






























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