# Process many values efficiently

<dl class="api-definition">
<dt>Concept</dt>
<dd><a href="/docs/development/opcua/client/bulk-access">Process many values efficiently</a></dd>
</dl>

| Type | Description |
|---|---|
| [OpcClient](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/) | Provides session based methods to access OPC UA server services. |
| [OpcClientServices](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclientservices/) | Defines the different services supported by the [OpcClient](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/). |
| [OpcMonitoredItem](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcmonitoreditem/) | Represents a node and one of its attributes (= node data) to subscribe to monitor data changes or events on the node. |
| [OpcReadNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcreadnode/) | Defines a single command of the [IOpcReadNodesService](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.iopcreadnodesservice/). |
| [OpcStatus](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatus/) | Provides information about the outcome of an operation. |
| [OpcStatusCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscollection/) | Representes a collection of [OpcStatus](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatus/) instances. |
| [OpcSubscribeDataChange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscribedatachange/) | Represents a single OPC UA service command which addresses the 'CreateSubscription' service to define a single monitored item to monitor data changes through a subscription using the setup represented. |
| [OpcSubscription](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcsubscription/) | Provides mechanisms to monitor a set of attributes (= node data) and (node-related) events using notifications being reported from the server to the client. |
| [OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/) | Stores a value optionally associated with status and timestamp information. |
| [OpcWriteNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcwritenode/) | Defines a single command of the [IOpcWriteNodesService](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.iopcwritenodesservice/). |