Fetch a related object.
This should be used in conjunction with a <dbname>.links.ini file
configuration (see the introduction on linking for details on this).
You may also use this with all parameters to specify, the column, and
related table and column.
Parameter
string $column -
either column or column.xxxxx
string $table - name of table to look up value in
string $link - name of column in other table to match