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Using a computer and some clever control electronics you can control your lights, power sockets, alarm systems, curtains, etc. In the US there is X10 Wireless whose main line of business is this kind of thing. Another good contact is the UK electronics catalogue MAPLINS where you can find mains electric control modules. Worth looking for.
x10 wireless computer control home equipment
Maplins electronics catalogue
Although the basic modules required are well within the current technology, home automation is relatively uncommon, a bit like gas lighting was when it had just been invented!