You can execute any action which is provided by the ageng (e.g. System.Restart). Also you need to select target object (where action will be executed).
List of actions can be queried from the agent, either with "nxget -l AGENT_IP Agent.ActionList" or in the GUI - right click on the node, then select Tools -> Info->Agent->Supported actions
List of actions can be queried from the agent, either with "nxget -l AGENT_IP Agent.ActionList" or in the GUI - right click on the node, then select Tools -> Info->Agent->Supported actions