Zoom 4312A - Manual (Page 147)

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The window in which you enter the passkey will not appear once you have connected
more than two times to the device.
Changing the default connection
The "default connection" refers to the dial-up connection configured for use whenever
a connection is made to the Internet.
If several connections have been registered, you can change the default connection by
following the procedure below.
1. Start Internet Explorer.
2. Click on [Tools]→[Internet Options...].
The [Internet Options] window will appear.
3. Click on the [Connections] tab.