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Users can update TN3270 Plus preferences by opening the Setup menu and selecting Preferences. See the Preferences Command for a description of each preference setting.

The TN3270 Plus user preferences are kept in the following doubleword registry key:

HKEY_CURRENT_USER\Software\SDI\ TN3270 Plus\Configuration\Preferences

By default, the preference settings are user specific. Administrators can apply preferences to all users and also have the ability to set some preferences that are not available to the user.

Administrators can set preferences for all users on the PC by copying the doubleword value from
HKEY_CURRENT_USER\Software\SDI\ TN3270 Plus\Configuration\Preferences
HKEY_LOCAL_MACHINE\Software\Wow6432Node\SDI\ TN3270 Plus\Configuration\Preferences (64-bit Windows)
HKEY_LOCAL_MACHINE\Software\SDI\ TN3270 Plus\Configuration\Preferences (32-bit Windows)

and then deleting
HKEY_CURRENT_USER\Software\SDI\ TN3270 Plus\Configuration\Preferences.

The Preferences key is a doubleword and uses the following hexadecimal values: To add a preference, add its value to the current Preference value.


Application Startup

Show Connect at startup


Application Termination

Terminate automatically when the last session closes


Ask for confirmation before terminating if sessions are still connected.


Session Termination

Warn me when the host closes a session


Ask for confirmation if I close a session


Full Screen Mode

Show instruction when going to full screen mode


Honor session setting for toolbar, status bar and OIA


Display main menu bar


Application Window

Always on top


Start each session in a new window


Don't show session tabs (requires restart)


Show session tabs above terminal window (require restart)


Additional Preferences

The following preferences are not included in the Preferences dialog box, but they can be changed by adding the following value(s) to the Preferences registry key referenced above:

Disable menu bar


Disable popup menu



It is suggested that you use the DisableMenuBar and DisablePopupMenu registry keys instead the the Preferences key referenced in this topic. The technique above is no longer recommended and is only documented here for backward compatibility.

TN3270 Plus is continually being improved. To learn more about the latest enhancements, please review our Version History web page.