An environment variable for use cases such as UPnP AV use cases. The environment variable of the present invention is used to store the physical location of the user. For example, the environment variable can be used to identify a particular location as being a user's living room, kitchen, etc. The information stored in the environment variable can be used to enhance the user experience of the digital home or other environment by minimizing the number of manual selections that the user has to make in order to initiate a use case such as playing music in a bedroom or watching movies in a living room. The environment variable is used to trigger a change of a profile and select the devices needed to implement different use scenarios.