Happy that explanation helped.
Configurations and monitoring (SSID/AP settings/Switch) are centrally done from master AP. Other APs will follow the master's configurations. So One single UI for all APs in the property.
When you move around with a smartphone, phone roams from one ap to another, Since config and client info/stats are centrally managed by the master, roaming will be seamless.
HTH.
Thanks
Karthik.