When you right-click a System Tree node, a context menu is shown. The context menu options are node-specific. These are actions defined in the AggreGate Server context corresponding to the current node. The action usually interacts with the user by executing different UI Procedures.
Menu item corresponding to a default action (i.e. action started upon double-click on a node) is highlighted in bold.
For some nodes, the context menu also contains a "Group Actions" submenu. It contains action you can apply on every child of the current node. See action grouping for more info.
Here's what the System Tree context menu for a Device node looks like:
