> For the complete documentation index, see [llms.txt](https://docs.workersforlabview.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.workersforlabview.io/worker-apis/case-labels.md).

# Case Labels

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Case labels are VIs with a **c\_** prefix in their filename, identifying them as a Case Label.
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A Case Label is a string constant that is wrapped in a VI, that is a member of a Worker and corresponds to the name of a Worker's MHL case. Case Labels are created automatically by the [Create MHL Case tool](/workers-tools/quickdrop-shortcuts/create-mhl-case-tool-ctrl+9.md) when a MHL case is created that is not associated with a Local API Request. An example would be when a MHL case is created to receive a Public Response message from a subWorker. Case Labels are added automatically to a Worker's dedicated **Case Label** folder, as shown in the image below.

<figure><img src="/files/KJChyZ9mj7qQfNL2lSaL" alt=""><figcaption><p>Case Label in a Workers project</p></figcaption></figure>

<figure><img src="/files/RMPMlW4hMlb7DLK5ZuqH" alt=""><figcaption><p>Case Label used in a Set Initialization Data VI, used to register a Public Response message with a subWorker.</p></figcaption></figure>