Some say it isn't really - many languages lack the variations in form that make agreement necessary. As far as using English is concerned, agreement might be compared to wearing matching socks:...
The security key is the password for the wireless router.
It'll show up if the wireless encryption is :
WEP
WPA-PSK (TKIP)
WPA2-PSK(TKIP)
WPA-PSK (AES)
WPA2-PSK (AES).