Answer: My Sine will allow you to configure multiple sites from one computer. My sine is $99. My Sine Pro has a USB dongle and will allow you to install and run copies of My Sine Pro on different computers (only one copy can run at a time). You can purchase My Sine now and upgrade it to My Sine Pro in the future if necessary. My Sine Pro is $169 plus shipping.
Thanks for your interest in Plus Sine. We are currently working on just
what you are asking about. It will be a "scaled down" version of Plus Sine.
We hope to have a Beta copy ready in about 60 days. The cost will be
about $250 for the core copy and $50 for every additional site you want to
called and logged. It will also be capable of sending a text message if a
channel is out of limits.