Yes, one person can use inFlow on up to two computers, as long as they use inFlow on only one computer at a time.  This happens most often when one person switches between desktop and laptop computers, or between work and home computers. 

When using inFlow in single-user mode, you can switch between computers by using the Backup Data feature to save the inFlow database to a file.  You can then bring this file to the second computer, and use Restore Data to load it.

When using inFlow in multi-user mode, both computers can connect to the server, but not at the same time.  In this case, be sure to close inFlow before switching computers.  This will still work even when one of the computers involved is also the server.