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Displays a dialog containing prompt, a text input field,
and two buttons, one labeled "OK" and the other labeled "Cancel."
The initial contents of adr, if any, are not used.
The password is displayed as asterisks or bullets.
It then waits for the user to click on one of the buttons.
If the user clicks on "OK," it transfers the password to adr.
If the user clicks "Cancel," the original contents of adr are left unchanged.
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