Novell ZENworks 10 Configuration Management
When running the built in report "ZCC -> Reports -> Device Lists -> "Devices By Machine / Login Name"" not all devices are counted in the top left value.
This is fixed in version 10.0.3 - see KB 3486285 "Updates to ZENworks 10 Configuration Management" which can be found at https://www.novell.com/support
Note: It is only the count shown at the top of the report that may be inaccurate. The report itself contains all of the workstations.