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---
name: tia-multiuser
description: >
TIA Portal Multiuser Engineering operations. Use for managing server projects,
local sessions, and multiuser commissioning workflows.
---
# TIA Portal Multiuser Engineering
## Scope
Multiuser Engineering workflows using the TIA Portal Openness API.
Covers Local Sessions, Server Projects, and Multiuser Commissioning.
---
## 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). |
---
## 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`.
