We implement the concurrent user model. This means that the decisive factor in determining the licensing fee is the actual number of users logged on to the system at any one time. The ArcFlow licensing costs, therefore, are determined solely by the number of concurrent DMS users and not by the number of workstations on which the system has been installed. The licensing fee includes the complete range of ArcFlow functions. The number of users can be modified flexibly and quickly at any time, if necessary.