I have set my database to use NT Authentication. I have set up several Oracle users: an Oracle user to match the NT local admin account for the Server and an Oracle user to match the domain account. So, I can connect to the database at the server from the command line using

plus80w.exe /@orcl

I can also connect to the database from my client Windows95 machine from the command line using the same syntax.

However, I can't connect using SQL*Plus from a desktop icon without being presented a logon screen.
What do I need to do to connect directly to the database without getting a log on screen??