Device descriptors are specified in an application profile to determine capabilities of particular devices that might be present in a network. A Home Automation profile includes such devices as light switches, thermostats, and others. Each device description contains a list of clusters this type of device must be able to send and receive. For simple cases all devices in a network can be configured to be same with all clusters enabled for exchange. In order to differentiate applications running on a single node, ZigBee standard specifies application end points that uniquely identify user applications and act as communication ports on the application layer. As an example, a remote control which can both turn on and off a light and control an air conditioner hosts two different applications at the same time and therefore needs two application end points. In total the ZigBee standard allocates 240 end points on each node for user specific applications. In wireless networks many devices can be located within the coverage area of each other, but each node needs to exchange data only with particular nodes and not with all of them. A procedure of establishing virtual connections between application end points on different nodes is called binding.