Check out this Yahoo use group, it's dedicated to TACT issues and is supported by the manufacturer.
Tact is very helpful when you call them. They always answer the phone during business hours, and are very patient in explaining things. You can also ask them by email. I learned the 2.0 software by trial and error, but now have the 2.2x. The software for the 2.2X has a much steeper learning curve than the 2.0., and I've had to speak to them several times. Make sure that, if you bought the 2.0 used, you have the most up-to-date software.