> For the complete documentation index, see [llms.txt](https://dcyf.gitbook.io/cmshandbook/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://dcyf.gitbook.io/cmshandbook/participants-and-staff/registering-participants-in-cms/unique-identifiers.md).

# Unique Identifiers

Each registered participant is assigned a unique identifier in the CMS known as the *Person ID*. The *Person ID* can be used to distinguish participants with similar names and is displayed in the Personal Information section of the participant profile. Additionally, the *Person ID* is used when uploading participant demographics and attendance using the *Upload Tool*.

To download a complete list of registered participants and profile data, including Person IDs, navigate to the *Data Extracts* module and select the *Participant, Parent and Staff* Extract. Before generating the extract, select one or more Person Types and Registration statuses. This will generate a spreadsheet with the profiles that meet your search parameters.

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