Audiovox SMT 5600 / SPV C500 (HTC Typhoon)

I have an Audiovox SMT 5600 w/Cingular. I have three questions. 1.) How do I, can I set up my phone to be used as a modem for my laptop? 2.) How do I rename the mobile device in Active Sync? I have two phones and two computers and I would like to be able to rename the phones. 3.) How do I get the calendar to stop duplicating events every time I sync between the two phones and computers? I end up with multiple appointments of the same item.