In response to the fast growing prominence of windowless buildings due to potential or possible aesthetic, psychological, and economic advantages, this article was written to discuss--(1) effects of windowless construction on the life safety of building occupants, (2) the possible extents of fire damage to the building and its contents, and (3) the probable efficiency of fire department operations. Windows are identified as desirable supplementary escape routes in cases of substandard or even properly designed interior exits. The use of windows is described in venting heat and smoke from buildings reducing the spread of fire through heat build up, and damage from smoke and sprinkler systems. The difficulties allowing firemen access to the building due to smoke build-up or lack of means for entry are indicated. Suggestions include--(1) consideration of special fire problems, (2) maintenance of automated sprinkler and venting systems, (3) adequate subdivision of areas, (4) plentiful exits and emergency lighting, (5) knockout panels for access, and (6) knowledge by fire fighters and occupants of interior arrangement, routes, and exits. (MM)