Returns a connection index on success, or FALSE if the connection
could not be made. Opens a persistent connection to a Hyperwave
server. Each of the arguments should be a quoted string,
except for the port number. The username
and password arguments are
optional and can be left out. In such a case no identification with
the server will be done. It is similar to identify as user anonymous.
This function returns a connection
index that is needed by other Hyperwave functions. You can have
multiple persistent connections open at once.
See also hw_connect().