wanted software feature

– memoryless posting – so that, if someone gives me, say, their confidential telephone number, their confidential telephone number does not thereafter live forever in auto-fill heaven, waiting to be accidentally input into some unintended data-field. That is, when I receive an item of data, I should have the option of marking it as a memoryless item. If I do not so mark it, then the old regime just follows along as before.
[Information Technology (IT)]
[user friendliness]