what is the difference between quickbooks pro 2012 and quickbooks pro 3-user 2012
what is the difference between quickbooks pro 2012 and quickbooks pro 3-user 2012
what is the difference between quickbooks pro 2012 and quickbooks pro 3-user 2012



Three users. That is the difference. Simultaneous use.
Without a multi-user license, you can only have one computer running QB and only one computer can be working in the data file.