git:20260504.aa4f1e9 to git:20260624.61b126a

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name: tia-multiuser

description: >

TIA Portal Multiuser Engineering operations. Use for managing server projects,

local sessions, and multiuser commissioning workflows.

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# TIA Portal Multiuser Engineering

## Scope

Multiuser Engineering workflows using the TIA Portal Openness API.

Covers Local Sessions, Server Projects, and Multiuser Commissioning.

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## Reference files

Load ONLY the reference file(s) relevant to the task.

| Reference file | Load when the task involves |

|---|---|

| `references/v21-api-surface.md` | Comprehensive reference for `Siemens.Engineering.Multiuser` (LocalSession, ServerProject, MultiuserService). |

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## Key Workflows

### Managing Local Sessions

1. Locate the `MultiuserService` on the Project.

2. Use `LocalSession` to interact with server projects.

3. Perform `Update()` to sync with the server.

4. `CheckIn()` changes to the server project.

### Multiuser Commissioning

1. Access `MultiuserCommissioningService` for commissioning tasks.

2. Manage asynchronous execution states.

## Enforcement

1. Always verify the `LocalSession` state before performing a `CheckIn`.

2. Use `AccessOptions` to handle conflicts during `Update`.