1. Attempt a connection using the parameters as passed in.
2. If DBTC = Y, attempt a trusted connection.
3. Attempt Logging on using the User ID and Password supplied, if any. This is for backward compatibility.
4. If it's an Imported table, prompt the user repeatedly until a connection is successfully made or the dialog is cancelled. (This applies only to interactive LANSA processes running on Microsoft Windows.)
5. Fatal error.
