anchor.diff:  :#                  Added a backspace entity.                                 #
   :#   2015-12-01 JFL Bug fix: %FUNCTION% with no arg did change the exp. mode. #
   :#   2016-09-01 JFL Bug fix: %RETURN% incorrectly returned empty variables.   #
  +:#   2016-11-02 JFL Bug fix: Avoid log file redirection failures in recursive #
  +:#                  scripts.                                                  #
   :#                                                                            #
   :#----------------------------------------------------------------------------#
   
  
positive.code: :#   2016-09-01 JFL Bug fix: %RETURN% incorrectly returned empty variables.   #
  :#                  Added registry access routines.			      #
  :#   2016-10-19 JFL Bug fix: Routine :Exec now preserves initial errorlevel.  #
  :#                                                                            #
  :#          Copyright 2016 Hewlett Packard Enterprise Development LP         #
  :# Licensed under the Apache 2.0 license  www.apache.org/licenses/LICENSE-2.0 #
  
negative.code: :#                  %RETURN#%       Idem, with comments after the return      #
  :#                                                                            #
  :#  Variables       %>DEBUGOUT%     Debug output redirect. Either "" or ">&2".#
  :#                  %LOGFILE%       Log file name. Inherited. Default=""==NUL #
  :#                                  Always set using call :Debug.SetLog       #
  :#                  %DEBUG%         Debug mode. 0=Off; 1=On. Use functions    #
  :#                                  Debug.Off and Debug.On to change it.      #
  :#                                  Inherited. Default=0.                     #
  