How do I connect to a database? I log in to the server, I fire up SQL Plus, I log in, I'm dropped at a SQL> prompt, and I have not yet told it what database I want to connect to. Currently I have 3.

We have our SQL server configured to only allow Windows accounts (i.e. not mixed). However, in some cases we are connecting from non-domain boxes and we want to specify a domain account to connect ...