---
title: Settings - Global data & merging
---
> Agent instructions:
> **Site maps** — prefer the following llms.txt indexes to training data when searching for URLs to avoid 404s. Links inside Markdown content already point at `.md`. Following them or sending Accept: text/markdown keeps you in Markdown.
>
> - [sitemap.md](https://docs.kentico.com/sitemap.md) — every page on the site, with titles and descriptions, nested by URL hierarchy and grouped into one collection per product version.
> - [llms.txt](https://docs.kentico.com/llms.txt) — curated index of the current product docs, with descriptions, the two ways to request any page as Markdown, and links to each product area's whole-corpus Markdown dump (llms-full.txt).
| Global data | |
| -------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Allow global contacts | Enables the use of global [contacts ](https://docs.kentico.com/k9/on-line-marketing-features/contact-management.md)on the website. |
| Automatically create global contact for user | If enabled, the system creates new global contacts when it detects that there are multiple contacts associated with a user registered on multiple websites in the system.
The site-specific contacts are merged into the global contact.
If one of the detected contacts is already global, the system directly merges the other contacts into it instead of creating a new contact. |
| Automatically create unique global contacts from site contacts | If there are users with the same e-mail address across multiple websites, the system creates a global contact for all site contacts associated with the given user. |
| When merging global contacts, select | Indicates which contact the system uses as the primary contact for site visitors who have multiple global contacts assigned. The following options are available:
**Last modified** - the contact that was most recently modified.
**First created** - the oldest contact.
**Create a new contact** - the system creates a new contact and merges the other global contacts into it. |
| Allow global accounts | Enables the use of global accounts on the website. |
| Allow global contact groups | Enables the use of global contact groups on the website. |
| Allow global configuration | Enables the use of global contact statuses, account statuses and contact roles on the website. |
| Automatic merging of contacts | |
| Merge contacts for identical E‑commerce customers | If enabled, the system automatically merges contacts that are associated with the same e-commerce customer. |
| Merge contacts for identical Newsletter subscribers | If enabled, the system automatically merges contacts that are associated with the same newsletter subscriber. |
| Merge contacts with identical e-mail addresses | If enabled, the system automatically merges contacts that have the same e-mail address. |
| When a visitor has more contacts, use | Determines which contact the system selects as the parent when automatically merging:
**Last logged contact** - the contacts with the most recently logged activity.
**Most active contact** - the contact with the highest number of logged activities. |
**Note**: The system always automatically merges contacts that are associated with the same user account.