While writing your program,  you  can  use  the  COMPILE  and  REVIEW
  commands  to  compile your code and review compilation errors without
  leaving the editing session.

  Supported VMS language compilers  generate  a  file  of  compile-time
  diagnostic information that LSE can use to review compilation errors.
  The  diagnostic  information  is  generated  with  the   /DIAGNOSTICS
  qualifier.

  The COMPILE command issues a DCL command in a  subprocess  to  invoke
  the appropriate compiler.  LSE checks to see if the language provides
  /DIAGNOSTICS capabilities.   If  so,  LSE  appends  the  /DIAGNOSTICS
  qualifier onto the compilation command.

  For example, if you issue the COMPILE command  while  in  the  buffer
  TEST.ADA, the resulting DCL command is as follows:

      $ ADA DEV:[DIRECTORY]TEST.ADA/DIAGNOSTICS=DEV:[DIRECTORY]TEST.DIA

  LSE supports all of the compiler's  command  qualifiers  as  well  as
  user-supplied  command  procedures.   You can specify DCL qualifiers,
  such as /LIBRARY, when invoking the  compiler  from  LSE.   (See  the
  Command Dictionary for details on the COMPILE command.)

  The REVIEW command displays any  diagnostic  messages  that  resulted
  from  a  compilation.   LSE  displays  the  compilation errors in one
  window, with the corresponding source  code  displayed  in  a  second
  window.

  This multiwindow capability allows you to review  your  errors  while
  examining  the associated source code.  This eliminates tedious steps
  in the error correction process and helps ensure that all the  errors
  are fixed before looping back through the compilation process.

  LSE provides several commands to help you review errors and exam your
  source  code.   The  following lists these commands and their default
  key bindings.

       COMPILE/REVIEW
            compiles and reviews the content of the current buffer.

       END REVIEW
            terminates the current review session.

       GOTO SOURCE
            uses the current cursor position in $REVIEW to select
            the diagnostic in the source buffer. This command is
            bound to CTRL/G.

       NEXT ERROR
            selects the next diagnostic message from $REVIEW.

       NEXT STEP
            selects the next diagnostic message from $REVIEW.
            This command is bound to CTRL/F.

       PREVIOUS ERROR
            selects the previous diagnostic message from $REVIEW.

       PREVIOUS STEP
            selects the previous diagnostic message from $REVIEW.
            This command is bound to CTRL/B.

       REVIEW
            displays the diagnostic messages resulting from a
            compilation.