my $dbh = DBI->connect("dbi:ODBC:$instance", "########", "########");


##</code><code>##

[SRV2]
Description = A default instance and port specified because server isn't running a "browser" listener.
Driver = FreeTDS
Server = n.n.n.n
Port = 1433
Database = whatever
TDS_Version = 9.0
try server login = yes

[SRV1-INST1]
Description = A named instance, no port specified because so it will use the "browser" listening port
Driver = FreeTDS
Server = n.n.n.n\INST1
Database = whatever
TDS_Version = 9.0
try server login = yes