If you're developing an application that has UI, you have to connect monitor and input devices to your device. Sometimes, connecting those devices might not be convenient, e.g., if you're mobile. As an alternative, you might want to use the Remote Client app to access UI of your device over the network.
To use the Remote Client app, first, you'll need to enable Windows IoT Remote Server from the Device Portal.
Next, download "Windows IoT Remote Client" from Windows Store. Then, start it, select the device you want to connect and click "Connect."
You'll see Windows 10 IoT Core desktop on the Remote Client window.