main:

  fork(child1);
  fork(child2);
  
  # endless loop until signal caught from
  # shell (child1):
  loop(read from child1) {
      react
  }

  # endless loop until signal caught from
  # shell (child2):
  loop(read from child2) {
      react
  }

main END:

##</code><code>##

main:

  fork(child1);
  fork(child2);
  
  # endless loop until signal caught from
  # shell (child1):
  loop(read from child1) {
      react
      # endless loop until signal caught from
      # shell (child2):
      loop(read from child2) {
          react
      }
  }

main END:

##</code><code>##

main:


  fork(child1);
  fork(child2);
  
  # endless loop until signal caught from
  # shell (child1):
  loop(true) {
      check child1  # call sub reacting from input;
      check child2  # call sub reacting from input;
  }                 # loop until a signal is caught.

END main: