code: function(){
  					if (arguments.length > 0) {
  						for (var i=0; i<arguments.length; i++) {
  							chain.push(arguments[i]);
  						}
  						group = chain[chain.length-1];
  					}
  					else group = false;
  
  					advance_exec_cursor();
  
  					return chainedAPI;
  				}
docs: force LABjs to pause in execution at this point in the chain, until the execution thus far finishes, before proceeding