Brain–computer interfaces have the potential to enable severely disabled individuals to communicate with other people and to control their environment. Communication functions consist mainly of sending/receiving emails, chatting, using VoIP phones and surfing the web. During the last 10 years, it has been proven in the labs that persons, even those suffering of severe disabilities, may interact with computers by only using their brain – in the extreme case using the brain channel as a single switch, just like a computer mouse.