D-Link 16-Port 10/100/1000Mbps Gigabit Ethernet Switch + 2-Port Mini GBIC Web-Smart Switch DGS-1216T - Manual (Page 25)

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Figure 7. Web Management Utility
The Web Management Utility was divided into four parts, Discovery
List, Monitor List, Device Setting and Toolbar function, for details
instruction, follow the below section.
Discovery List
This is the list where you can discover all the Web management
devices in the entire network.
By pressing the “Discovery” button, you can list all the Web
Management devices in the discovery list.
Double click or press the “Add to monitor list” button to select a
device from the Discovery List to the Monitor List.