# SESSIONID

Location: [gRPC API](https://developer.m-files.com/APIs/gRPC-API/index.md) > [Reference](https://developer.m-files.com/APIs/gRPC-API/Reference/index.md) > [Messages](https://developer.m-files.com/APIs/gRPC-API/Reference/Messages/index.md)

HTML version: https://developer.m-files.com/APIs/gRPC-API/Reference/Messages/MFiles.SESSIONID/

Session ID.

- **Full name:** `MFiles.SESSIONID`
- **Proto file:** [`mfiles/structs.proto`](https://developer.m-files.com/APIs/gRPC-API/downloads/proto/mfiles/structs.proto)

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## Fields

| Field | Type | Number | Description |
|---|---|---|---|
| <a id="f-value"></a>`value` | `bytes` | 1 | 64-byte session ID in RPC interface. 48 bytes in gRPC interface. |

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## Used by methods

- [IRPCObjectOperations.SetProperties](https://developer.m-files.com/APIs/gRPC-API/Reference/MFiles.IRPCObjectOperations/SetProperties/index.md): Adds, replaces or removes property values of an object.
- [IRPCObjectOperations.SetPropertiesWithMetadata](https://developer.m-files.com/APIs/gRPC-API/Reference/MFiles.IRPCObjectOperations/SetPropertiesWithMetadata/index.md): Adds, replaces or removes property values of an object, also storing metadata about each value.

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## Used in fields

- [`SetPropertiesRequest.signature`](https://developer.m-files.com/APIs/gRPC-API/Reference/MFiles.IRPCObjectOperations/SetProperties/index.md#request): The session ID of a second LogIn of the same user, made less than 15 seconds before this call, when a workflow state transition requires an electronic signature. Unset otherwise.
- [`SetPropertiesWithMetadataRequest.signature`](https://developer.m-files.com/APIs/gRPC-API/Reference/MFiles.IRPCObjectOperations/SetPropertiesWithMetadata/index.md#request): The electronic signature that might be required by a workflow state transition operation.