Starting with Poser 11.3 you can run your Poser seats simultaneously. Every purchase of poser automatically includes 3 seats. Prior to Poser 11.3 running 2 copies at the same time, on the same local network was blocked.

The new activation system used in Poser 11.3 and newer removes that restriction. If you need more seats we have seat expansions available.

I do this every day when looking for discrepancies between Mac/Windows and OS version on features and fixes for Poser.