It would become a utility, like the heating or hot water system, always functioning. It necessarily has cables and USB-type connection devices in the various rooms of the house where conventional computer applications go on. The home office has only a flat screen and either keyboard or voice input. The kitchen has an electronic bulletin board. The family room has the HDTV screen and home theater sound system.
Printers are wherever convenient.
The hallways have the security and outside monitor screens. The basement computer processes it all. Now what we have known as a personal computer takes a giant leap. Even more meaningful, continuous monitoring means the family schedules, activities, and whereabouts are always available and current. Assigned Internet agents can flash important news and announcements at any time to electronic bulletin boards in the kitchen or other rooms of the house and relay the information to family members where ever they might be.