> ## Documentation Index
> Fetch the complete documentation index at: https://docs.symmetry.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Symmetry Payroll Forms hosted network diagram

> Map SPF Hosted network components for architecture and security planning. Covers key Hosted elements, traffic paths, and client integration touchpoints.

The network diagram below outlines the key components of the SPF hosted environment.

## Hosted network diagram

Click on the image to enlarge the setup for SPF Hosted.

<img src="https://mintcdn.com/symmetry-prod/iQnpDJuhlimWxDgw/spf/assets/images/49062136499476.png?fit=max&auto=format&n=iQnpDJuhlimWxDgw&q=85&s=152fcb589e5ce8e1dcbb901ae2c12e69" alt="" width="1041" height="647" data-path="spf/assets/images/49062136499476.png" />

## Key elements of SPF hosted

Read more below to learn more about the four key elements in the network diagram:

1. [SPF Registration JSON](/spf/hosted-and-on-premise/registration#spf-registration-overview)
2. [Registration](/spf/hosted-and-on-premise/registration#submitting-the-spf-registration-file-to-spf)
3. [Helper Pages](/spf/hosted-and-on-premise/helper-pages) and [Sample Hosted Interface using Settings Builder](/spf/hosted-and-on-premise/settings-builder)
4. [Returning Form Data (Postback or Print Only)](/spf/hosted-and-on-premise/returning-form-data)