anchor.diff:  %%%  |               -,        ,-               |
   %%%   '-,              '-,  ,-'              ,-'
   %%%      '-,_          _,-''-,_          _,-'
  -%%%          '--------'        '--------' 
  +%%%          '--------'        '--------'
   %%% '''
   %%%
   %%% If either the pid specification excludes a process or a trace pattern
  
positive.code: %% of trace messages to be received, or a maximal frequency (`{Num, Millisecs}').
  %%
  %% Here are examples of things to trace:
  %% 
  %% <ul>
  %%  <li>All calls from the `queue' module, with 10 calls printed at most:
  %%      ``recon_trace:calls({queue, '_', '_'}, 10)''</li>
  
negative.code:             end;
          false ->
              exit(shell_funs_only)
      end.
  