| House-Control | The system which is installed in the house, consists of a controller a some sensors and actuators. |
| House-control remote control | The remote control tool available at flex-control.dk using a computer, or as an app. |
| Booking agency | The booking agency which takes care of renting if a renting contract exists between the house owner and the agency. |
| Instruction | A user or booking system initiated action, which changes the house-control state. |
| Browser | Program for showing websites (incl. house-control remote control). |
| Operation system | Software system for the computer like Microsoft Windows |