The navigation tree organizes all groups, gateways, devices and monitors managed by Network Monitor. Using the tree you can quickly browse to any device and monitor.
Groups - Used to group other nodes on the navigation tree. Groups do not correspond to a physical device on a network. Think of them as representing logical business units, such as companies or departments, or a set of devices within a network.
A node cannot be the child of more than one parent. This includes a group node.
Groups can have sub-groups.
Groups can be added above or below a gateway.
Gateways - A gateway monitors devices sharing the same subnet. For a standard install of Network Monitor there is only one Local gateway and it refers to the same network the Network Monitor server is installed on.
Devices - Anything with an IP address. This includes computers, routers, switchers, mobile devices, printers, firewalls, etc.
Monitors - A monitor runs a specific test on a device and reports the result back to the server. A device can have multiple monitors.