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Smart home hubs typically offer APIs (Application Programming Interfaces) that allow external devices, like a PC, to send commands and interact with the hub to control various smart devices. These APIs might be in the form of RESTful APIs, WebSocket interfaces, or other protocols that enable communication between devices and the hub.

For instance, hubs like Samsung SmartThings, Amazon Echo (Alexa), Google Home, and others provide APIs that developers can use to create applications or scripts to control smart devices connected to these hubs. These APIs allow you to send commands such as turning lights on/off, adjusting thermostat settings, locking doors, and more.

Usually, to access these APIs, developers need to register and get authorization (API keys or tokens) from the hub's platform. Then, they can make HTTP requests or use SDKs (Software Development Kits) provided by the hub to communicate with the hub's server and control the connected smart devices.

If you're interested in developing an application or integrating your PC with a smart home hub, it's a good idea to check the hub's documentation or developer portal to understand the specifics of their API and how to use it for controlling smart devices.