Synopsis:
   $servergroup(<index>)

Technical:
   This function associates server group with the given index number, as
   shown in the client's internal server list.

Practical:
   This function is used to convert from a server's index number to its
   group name.  This is useful for determining which IRC network you are
   connected to and what other possible servers are in the same network.

Returns:
   name of the group of server, or "Unknown"

Examples:
   $servergroup(0)               returns group name of default server
   $servergroup($winserv())      returns group name of current server

See Also:
   server(1) servnum(6) winserv(6) servername(6) serverport(6)