This is an article that will explain about the Act! Web API and how it interacts with the Handheld Contact API application.

To begin, Act! describes the Web API as: The Act! Web API is a RESTful, JSON based API. This IIS application runs on your Act! Premium (access via web) server and allows you to seamlessly and easily connect and integrate your Act! Premium Contacts, Groups, and Activities with additional services as part of a Premium Subscription. It provides Do-It-Yourself integrations and automation across the business, as well as effective and flexible custom development capabilities.