is it possible... to send mysql a command of this sort?
SELECT * FROM databaseone.tableone, databasetwo.tabletwo WHERE databaseone.tableone.idfield = databasetwo.tabletwo.idfield AND databasetwo.tabletwo.field = 'abc';
ok, simple question, simple answer!
yes, its possible, and works just like that statement but it only works if you use a database user that has access to all the databases you need to access.