> For the complete documentation index, see [llms.txt](https://knowledge.illumina.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://knowledge.illumina.com/instrumentation/nextseq-1000-2000/instrumentation-nextseq-1000-2000-faq-list/000007856.md).
# How to switch user accounts on the NextSeq 1000/2000
The NextSeq 1000/2000 is installed with three accounts on the Operating System (OS): **ilmnuser** (standard), **ilmnadmin** (administrator) and **root** (super-administrator). For more information on these account types, see Knowledge Base Article
[User accounts and password management on the NextSeq 1000/2000](/instrumentation/nextseq-1000-2000/instrumentation-nextseq-1000-2000-reference_material-list/000003040.md)
To upgrade the control software, configure network settings, or perform troubleshooting, it is necessary to switch to the **ilmnadmin** administrator account.
**Note**: Only switch user accounts when the system is idle. Switching user accounts while a sequencing run is in progress may result in premature termination of the run.
**How to switch accounts:**
1. From the Control Software main menu, select **Exit Application** to access the Operating System.
2. Click the **power button** from the task bar in the upper right.
3. Select **Log Out** from the dropdown menu to log out of the current account and return to initial user selection screen.
4. Select the **ilmnadmin** administrative account and log in.\
**Note**: Once the administrative tasks are complete, repeat this process to log back into the **ilmnuser** account before performing a new sequencing run.
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| *For any feedback or questions regarding this article (Illumina Knowledge Article #7856), contact Illumina Technical Support* [*techsupport@illumina.com*](mailto:techsupport@illumina.com?subject=Question%2FFeedback%20Regarding%20Illumina%20Knowledge%20Article%20#000003040%20-%20Instrumentation%20\&body=Dear%20Illumina%20Technical%20Support,%0D%0A%0D%0A)*.* |
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