UOS is a multiuser, general-purpose timesharing system. It can serve as the controller for embedded controllers, web servers, timesharing, development, and other purposes. Although hardware may provide lower limitations, UOS can serve up to 65,536 network disks, and up to 1,507,328 directly-connected disks or other random-access storage devices.
UOS consists of the UOS Executive, the Init secondary bootstrap, standard device drivers, and system utilities (known as Commonly Used System Programs or CUSPs). Some of the major features of UOS include the following: