dbopen: avoiding config with direct host/port

Is there currently a way to open a connection without referencing the
config files?  This has been asked before but it's unclear if this is
possible:

http://lists.ibiblio.org/pipermail/freetds/2010q4/026425.html

There doesn't seem to be a way to do this using this call:

DBPROCESS *dbopen(LOGINREC * login, const char *server)

There are fields within LOGINREC (such as host & port) that could be used
to override config, but that doesn't seem to be the way it was implemented.

Any ideas?

erik