I have a sister who has Bright House (central Florida) cable Internet
> and digital phone service. She is confined to a wheelchair, and would
> like to make phone calls from her laptop computer, using a headset.
> Is this possible? Thanks for any help.
Till the end of the year you can make free calls to the US and Canada on Skype using "Skype Out" service from a computer with the Skype software installed. No special equipment is needed just a computer with headphones and a microphone.