Apex Central server: The Apex Central server is the machine upon which the Apex Central application is installed. The web-based Apex Central management console is generated on this server.

Agent: The agent is an application installed on a product-server that allows Apex Central to manage the product. It receives commands from the Apex Central server, and then applies them to the managed product. It also collects logs from the product, and sends them to Apex Central. The Apex Central agent does not communicate with the Apex Central server directly. Instead, it interfaces with a component called the Communicator.

Communicator: The Communicator is the communications backbone of the Apex Central system; it is part of the Trend Micro Management Infrastructure. Commands from the Apex Central server to the managed products, and status reports from the products to the Apex Central server all pass through this component. Only one Communicator is installed on each product server; the Communicator then handles the needs of all the agents on the aforementioned server.

Entity: An entity is a representation of a managed product on the Product Directory link. You see these icons in the directory tree of the Entity section. The directory tree is a composition of all managed entities, residing on the Apex Central console.