//***********************TANGO JavaScript API******************
  //Functions and variables used by TANGO system
  //Do not call those functions and do not use those variables directly
  //TANGO API constants and variables

    Tango_MASTER = 0; 
    Tango_SLAVE = 1; 
    Tango_NONE = 2; 
    Tango_status = Tango_NONE; 
    Tango_handle = null; 
    Tango_plugin = null; 
    Tango_init = false; 

  //Tango_setMaster - used by TANGO system, do not use this function
    function Tango_setMaster() {
      Tango_status = Tango_MASTER; 
      if (!Tango_init)
         Tango_start(); 
      Tango_init = true; 
    }

  //Tango_setSlave - used by TANGO system, do not use this function    
    function Tango_setSlave() {
      Tango_status = Tango_SLAVE; 
      if (!Tango_init)
         Tango_start(); 
      Tango_init = true; 
    }
 
  //finish - used by TANGO system, do not use this function 
    function Tango_finish() {
       window.close(); 
    }

  //end of functions and variables used by TANGO system 
  //***********************TANGO JavaScript API******************

  //Tango_isMaster() - master/slave status check
  //returns true if the running script is master, otherwise returns false
    function Tango_isMaster() {
       return(Tango_status == Tango_MASTER); 
    }     

  //Tango_isStandAlone() - standalone/non-TANGO mode
  //returns true if the script is running as a standalone application

    function Tango_isStandAlone() { 
       return(Tango_status == Tango_NONE);
    } 
 
  //Tango_askMaster - updates information about master/slave status of the script 
    function Tango_askMaster() {
      Tango_handle.askMaster();
    }
 
  //Tango_register - registers script in the TANGO system 
    function Tango_register() {
      if (parent.opener == null) {
        return; 
      }

      if (parent.opener.name == "Tango_CA") { 
        Tango_status = Tango_SLAVE; 
        Tango_plugin = parent.opener.navbar.document.local; 
				 name = window.name;

        AIDend = name.indexOf('_');
        SIDend = name.indexOf('_', AIDend + 1);
        AID = name.substring(3, AIDend);
        SID = name.substring(AIDend + 1, SIDend);
        AT = name.substring(SIDend + 1, name.length);                       
        Tango_handle = Tango_plugin.addScript(window, AID, SID, AT);	
        Tango_askMaster(); 
      }
    }   
  
  // Tango_start - called after data about master/slave status are initialized 
  // body of this function should be implemented by the script developer to 
  // launch/branch different scripts for the master and slave instances, or left empty
    function Tango_start() {
      //start of the code
        
      //end of the code         
    }
 
  //Tango_send - sends string to the TANGO system 
    function Tango_send(data) {
      if (Tango_isMaster()) Tango_handle.putMessage(data);
    }
 
  //Tango_receive - called by the TANGO system, when an message arrives,
  //body of this function should be implemented by the script developer
    function Tango_receive(data) {
      //start of message handling

      //end of message handling
    }

  //Tango_remove - quit from TANGO. This function is usually called when
  // the current page is unloaded, ie., in onUnload event of a body or frame    
    function Tango_remove() {
      if (!Tango_isStandAlone()) {
        Tango_handle.remove();
      }
    }
  //********************end of TANGO JavaScript  API************************
  /*Initial methods for registering in TANGO runtime and updating master/slave status */
    Tango_register();
 
  //End of initialisation - end of the TANGO code
  //Your code starts here