The Dell Precision T5820 workstation is typically designed as a single-user workstation for professional users for high-performance computing, graphics processing, and more.

While it can support some level of multitasking on hardware resources, it doesn't specify a fixed "maximum number of users." In a LAN environment, multiple users can theoretically access the resources on the workstation through network sharing and other means, but this is limited by various factors such as network bandwidth, workstation performance, and concurrent operations of simultaneous access.

If it refers to users who log in and use workstations locally at the same time, generally speaking, based on their operating system and design positioning, it is mainly for a single user to work efficiently, and logging in multiple users at the same time and performing complex operations may lead to system performance degradation.

In a virtualized environment, by creating multiple virtual machines, multiple "virtual users" can be supported according to the hardware resources and the configuration of the virtual machines, but the specific number needs to be evaluated and adjusted according to the actual hardware configuration and application needs.