On VAX processors, you can use the debugger with programs written in
  any of the following source languages:

      Ada       BASIC      BLISS      C
      C++       COBOL      DIBOL      Fortran
      MACRO-32  Pascal     PL/I       RPG II
      SCAN

  On Alpha processors, you can use the debugger with programs written in
  any of the following source languages:

      Ada       BASIC      BLISS      C
      C++       COBOL      Fortran    MACRO-32
      MACRO-64  Pascal     PL/I

  On I64 processors, you can use the debugger with programs written in
  any of the following source languages:

      Assembler (IAS)       BASIC      BLISS      C
      C++                   COBOL      Fortran    MACRO-32
      IMACRO                Pascal

  The debugger recognizes the syntax, data types, operators, expressions,
  scoping rules, and other constructs of a supported language.

  For more information about debugger support for a particular language:

  1.  Choose On Commands from the Help menu in a debugger window.

  2.  Choose Language_Support from the list of Additional Topics.

  3.  Choose the language name from the list of Additional Topics.