vRealize Orchestrator and vRealize Automation provide the architecture that supports the functions of vRealize Orchestrator Plug-in for Horizon.

vRealize Orchestrator plug-ins allow a consistent automation between the software environment in which the workflows are run and the products with which the workflows interact. With vRealize Orchestrator Plug-in for Horizon, workflows can be exposed natively, through the VMware vSphere® Web Client, to delegated administrators, and through the vRealize Automation service catalog. Although entitlement, scheduling, and execution of workflows are exposed through vSphere Web Client and vRealize Automation, you can customize and configure the workflows only in the vRealize Orchestrator client.

The following diagram illustrates the architecture of vRealize Orchestrator Plug-in for Horizon.

Figure 1. Architecture of vRealize Orchestrator Plug-in for Horizon
The plug-in is installed in Orchestrator, but the workflows are used in vSphere Web Client and vCloud Automation Center.