D-Link DWL-8200AP User Manual page 38

Note: If WPA or WPA2 is being used, it will occupy the key space 2 and 3, which will leave key 1
and 4 for other SSIDs to use for WEP.
When you configure one Multi-SSID, you must click Save to Table and then click Apply to save
your settings.
D-Link DWL-800AP User Manual
8