====== Pre-installed SW ======
The OS image you just uploaded into your unit also contains the preinstalled [[en:sw:02-apis:01-evok|EVOK]] open-source software - an Unipi-developed application programming interface (API) for direct communication with Unipi hardware.
Also available is a practical demonstration of using the API in the form of a simple web application (Unipi Control Panel) serving as a user interface for all inputs and outputs on the unit. To access this interface, open your web browser and enter the IP address of your unit with the port number **:80**. Port number is optional, as it is the default webserver port.
For example:
192.168.1.10
or
192.168.1.10:80
The application's interface looks like this:
{{ :en:sw:03-3rd-party:nodered:01_installation-of-nodered.png?direct |}}
Another software included in the disk image, which is now also uploaded in your unit, is [[en:sw:03-3rd-party:nodered|Node-RED]]. It is an open-source programming tool for connecting hardware devices, various APIs or online services. In this case, the Node-RED software already contains the EVOK API. This API is represented by a pair of nodes in the left panel, section Unipi - **unipi input** and **unipi output** made to control both analog and digital inputs and outputs.
{{ :en:sw:03-3rd-party:nodered:02_installation-of-nodered.png?direct |}}