TO disable IE's password caching, most likely what you are looking to do:
From your browser's toolbar, click [b]TOOLS>Internet Options>[/b] click the [b]Content[/b] tab and then click the [b]Auto Complete[/b] button. Uncheck the box that says [b]Prompt[/b] to save passwords'. Restart your browser, you MAY need to reboot the machine.
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For dial-up Network login you can disable the passowrd by disabling the DUN passwords through a redgedit.
Hive: HKEY_LOCAL_MACHINE
Key: SYSTEM\CurrentControlSet\Services\RasMan\Parameters
Name: DisableSavePassword
Type: REG_DWORD
Value: 1
After reboot, DUN will no longer disable the Save Password check box, nor will it remember any passwords set prior to this registry change.
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Website passwords are usually cached by the web servers when you register or login, the save is a function of thier server, as I'm sure you already know.
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Hope this helps, I am not sure i this forum has been updated to accept the [B].[/B] tags yet but if not, just read between the B's.