Yes. You can connect via the internet, either using your home PC as a terminal or with SmartTrade Server set up on your home PC. When you are connected from home, you will be a user in terms of the number of concurrent licences.
If you are using your home PC as a terminal, you need terminal services access. Windows XP Pro allows a single terminal services session, but doesn't allow more than one user to connect remotely at the same time.
To have more that one user connect remotely at the same time, you will need additional terminal services licences, or use one of the available 3rd party applications. Talk to us or your IT Provider about this.
You will need an internet connection with adequate band width for the number of users accessing remotely at any time, and a fixed IP address.