Server
Information on IRC Servers are at IRC Server
Command
The /server command allows users to connect to (another) IRC Server on the main client. It is disabled in widgets.
URI Parameter
This parameter lets Mibbit know what server to connect to. In widgets, it connects to that server after the user had connected to Mibbit (including autoconnection). In the main client, it pre-sets the connect-form (if a channel is given as well).