Allied Telesis AT-WA7400/EU - Manual (Page 220)

Appendix B: Configuring Security on Wireless Clients
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Figure 1. Wireless Network Connections Properties Dialog Box
2. From the list of Available networks, select the SSID of the network to
which you want to connect and click Configure.
List of available networks changes depending on
client location. Each network (or access point) that
that is detected by the client shows up in this list.
(“Refresh” updates the list with current information.)
For each network you want to connect to,
configure security settings on the client
to match the security mode being used by
that network.
Note: The exception to this is if the access point is
configured to prohibit broadcast of its network name,
the name is not shown on this list. In that case
you would need to type in the exact network name
to be able to connect to it.