A tree is used for representing relationships between various entities and, in an embodiment, may be used for conducting transactions. In an embodiment, the tree may be dynamically updated at run time and/or each time an agent accesses the tree by, for example, conducting a transaction or requesting new information. An application running on a server may be used for accessing a database and generating a display language tree (which may be a tree written in a display language such as Hypertext Markup Language (HTML) or Extensible Markup Language (XML)). The application sends the display language tree to the agent's appliance where the display language tree is displayed. In an embodiment, nodes having different interrelationships, such as aggregation relationships and association relationships, may be handled differently from one another even if the same type of parent/child relationship is displayed in an image of the tree to the agent.