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Every form of delivery of voice, video, and data now seems to offer all three, either directly or through business deals. Will a phone call be free anywhere in the world? Will television programming schedules become obsolete?

And with Wi-Fi networks in many homes and businesses and now spreading into metropolitan-wide clouds of service, will we talk over Wi-Fi, watch TV over Wi-Fi and communicate with it?

Glenn Fleishman, who has been a technology journalist since 1994 and writes the Practical Mac column, answered a selection of your questions.