!747
!1001362 // named thread

m {
  static boolean free = true;
  static new L<PaA> programsStarted;
  
  static class PaA {
    S progID;
    S[] arguments;
    
    *(S *progID, S[] *arguments) {}
    *() {}
  }
  
  p {
    makeAndroid3("A multi-program VM. PID: " + getPID());
    sleep();
  }
  
  static synchronized S answer(S s, L<S> history) {
    new Matches m;
    
    if (match3("please start program *", s, m)) {
      if (!free) ret "Sorry, not free.";
      
      final S progID = formatSnippetID(unquote(m.m[0]));
      final S[] arguments = new S[0];
      programsStarted.add(new PaA(progID, arguments));
      
      // better call JavaX for translation in a single thread.
      final Class theClass = hotwire(progID);
      
      // program may run in its own thread.
      thread progID {
        callMain(theClass, arguments);
      }
      
      ret "OK.";
    }
    
    if (match3("are you free to start a program?", s))
      ret free ? "Yes." : "No."; // free is usually true, but may be set to false by someone to stop this VM from starting more programs.
      
    if (match3("list programs started", s))
      ret structure(programsStarted);
  
    ret null;
  }
}