Although a Yahoo! application ID is not necessary to complete this tutorial, you will need one to use Yahoo! Web Services to develop Web applications in the future. If you would like to obtain the Yahoo! application ID before continuing with the tutorial, please register for a Yahoo! application ID. Having an application ID will enable you to run the code in the tutorial, and you will be able to immediately work on your own Web applications.
Ready to continue with the tutorial? Great, let's go to Making a REST Request.