1. The Hardware tab: This is the raw or sometimes processed or normalized operating system as defined by the inventory source.

2. The VM Properties tab: This can be the configured operating system for the virtual container (particularly VMware virtual machines) or it can be the raw operating system. This field is not expected to be particularly accurate or reliably populated.

3. The Applications tab: This is the operating system as normalized by FNMS using either WMI or installer evidence.

1. The os property of the Host node. See the "Read computer details into FNMP" step of Computer.xml which gets details using the "Host Nodes" query in the FnmpADDMSettings.xml.

2. The config_os_full property of the DiscoveredVirtualMachine node or the vm_guest_os of the SoftwareInstance node. See the "DiscoveredVirtualMachine Nodes" and "SoftwareInstanceVirtualMachine Nodes" queries of FnmpADDMSettings.xml respectively.

3. The WMIEvidence.xml tries to produce something which will match the FNMS ARL as best as it can. It sets a WMI Caption property using the os property of the Host node and a WMI Name property using the os_type property of the Host node. Both of these come from the "Host Nodes" query in FnmpADDMSettings.xml.