link_indentifier in sybase_select_db()

[Anon]

What is the link_identifier ...????

sybase_select_db (string database_name, resource link_identifier)

sybase_query (string query, int link_identifier)

[Anon]

it is like. the connection to the database. ie:
$link = mysql_connect("localhost","name","password);
$sql = "select * from table";
$db = mysql_select_db("dbname",$link);
$result = mysql_query($sql,$link)

get the point? it is useful when doing multiple queries to different tables and or databases.