ORDERing two UNION queries: Non-Subquery UNION Execution

http://dev.mysql.com/doc/internals/en/select-union.html Does anyone know what this means? Can it be implemented in the flow of php code without explicitly creating temp tables in the database? My query is like: $query = "

       (SELECT
       Table.field, [other fields]
       FROM Table [other JOINs]
       ORDER BY Table.field
       )
       UNION
       (SELECT
       Table2.field, [other fields]
       FROM Table2 [other JOINs]
       ORDER BY Table2.field
       )
       ";

and I want the ORDER to apply to the whole UNIONed result. John