Prior to version 8.0, Comments were mainly used for associating long names with the nodes, and used as log files for the networks. The new Network Log offers now a proper log file for the networks, and the new node property Long Name is now available for associating a long name with the node.
They can be defined via the Node Editor, or automatically by using a Dictionary.
Long Names can be shown in the network (Node Contextual Menu | Properties | Rendering Properties | Show Long Name), in the monitors (Monitor Panel Contextual Menu | Show | Long Name of Nodes), in the graphs generated during the analyses (Graph Contextual Menu | Show Long Names), in the Search Tool (Contextual Menu | Show Long Names), in the editors (Contextual Menu | Show Long Names) (e.g. classes, costs, ...).