PARLAY 2.0's license key may be installed on more than one computer, such as a work computer and home office computer. But you can not have both open or in use at the same time as this will cause you to receive errors or not see parcels lines.
For concurrent use of PARLAY by two or more people at the same time, you would need additional licenses. Organization-wide licensing, and multi-license discount options are available. Please contact firstname.lastname@example.org for more information and pricing.