Our iRAPP Terminal Services application allows multiple users to connect to the same Mac at the same time.  This functionality also complies with Open Directory configurations.  Our Sessions Manager interface allows you to manage all users, servers and networks that are accessing the system. 

We strictly require and enforce that this feature is only available with OS X server to comply with Apple licensing requirements.  OS X server allows multiple sessions and the iRAPP TS application utilizes these sessions within the terms of the license agreement.