The film's Japanese title, which is written in kanji, translates into English as "Circuit."
A large number of scenes in this film were shot from windows.
An earlier horror film named Pulse (1988) had a similar plot about evil electrically-powered entities, but it is not connected to either this film or its 2006 Americanized remake in any way, shape, or form.
Kiyoshi Kurosawa: (at around 16 min. into the film) While Kawashima is looking at the various people moping around in a catatonic state via web cam, there is one man who appears to be sleeping on his desk. He then wakes up, raises his head, and looks straight into the camera, facing us. That man is Kurosawa Kiyoshi, writer and director of this film.