How to publish/integrate applications in Sugar CRM

Need to publish our application with Sugar CRM

Please let me know how we can integrate our application with Sugar CRM. We meant to customize Sugar CRM where we can have a extra button to launch our web application.So once the user will login into Sugar CRM, and click on this extra button, it should launch our application.

Please let us know where and how we can add extra button so that onClick event we can redirect to our Application's URL.button customfields