# Events

<dl class="api-definition">
<dt>Concept</dt>
<dd><a href="/docs/development/opcua/server/events">Events</a></dd>
</dl>

| Type | Description |
|---|---|
| [OpcEventNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/) | Defines a generic base class for all general characteristics of an OPC UA Event. |
| [OpcEventSeverity](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventseverity/) | Defines the different indications of the urgency of an event. |
| [OpcNodeManager](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/) | Provides an abstract base class used to organize and maintain the address space or only a part of it. |
| [OpcServer](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcserver/) | Represents an OPC UA server which provides the address space defined by its [NodeManagers](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcserver/members#nodemanagers) to its clients. |
| [OpcText](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opctext/) | Represents a human readable [string](https://learn.microsoft.com/dotnet/api/system.string) value optionally associated with a [Culture](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opctext/members#culture) and localization relevant information. |