The accessibility of urban space is usually considered in terms of ergonomics and mobility. However, while physical accessibility enables spatial mobility, it does not ensure universal access to the city as a complex foundation for human social and cultural activities. This article focuses on the need to understand cities as a social interface which requires the integration of technical resources for accessibility and participation; it explores what type of information technology should be included in this system; and it offers a brief reflection on the social implications of the Internet having replaced the city as a place for social meetings and participation. (...)