# CRM, UC, and the desktop are three contracts

- Blank is not one disease.

## Sources and go deeper

- [Technical requirements PDF](https://documentation-be.five9.com/bundle/five9-technical-requirements/raw/resource/enus/five9-technical-requirements.pdf). vendor. last checked 2026-10. Fetched for this lab in October 2026. Re-read before you buy hardware or open a firewall.
- [APIs and SDKs](https://www.five9.com/platform/integrations-and-ecosystem/apis-and-sdks). vendor. last checked 2026-10.
- [Agent Desktop](https://www.five9.com/products/capabilities/agent-desktop). vendor. last checked 2026-10.