anchor.diff:  :Exec.Init
   set "DO=call :Do"
   set "EXEC=call :Exec"
  -set "ECHO.X=call :Echo.NoExec"
  +set "ECHO.X=call :Echo.X"
  +set "ECHO.XD=call :Echo.XD"
   set "ECHO.XVD=call :Echo.XVD"
   if not .%NOEXEC%.==.1. set "NOEXEC=0"
   :# Check if there's a tee.exe program available
  
positive.code: :#   2015-11-19 JFL Adapted to new %UPVAR% mechanism.                         #
  :#   2016-11-11 JFL Avoid copying the input string. 5% faster.		      #
  :#                  Added routine :strlen.q. No tracing but twice as fast.    #
  :#                                                                            #
  :#----------------------------------------------------------------------------#
  
  
negative.code: :#                                                                            #
  :#                  Good practice:                                            #
  :#                  * Use :# for comments instead of rem.                     #
  :#                    + The # sign is the standard comment marker for most    #
  :#                       other scripting languages.                           #
  :#                    + This stands out better than the :: used by many.      #
  :#                    + This avoids echoing the comment in echo on mode.      #
  :#                    + Gotcha: A :# comment cannot be at the last line of    #
  :#                       a ( block of code ). Use (rem :# comment) instead.   #
  :#                  * Always enquote args sent, and dequote args received.    #
  