The interface parameter is required only if there is more than one wireless interface on the computer. Wildcard (*) names cannot be used to specify the interface name.
If the specified interface is already connected to a wireless network, this command disconnects the interface from that network, and then attempts to connect to the new network. If the command attempts to connect to a network to which the interface is already connected, this command returns a message that the connection was successful, and does not change the state of the wireless adapter.