Some interfaces have "hidden" modes. for example, for some half-open garage doors, the user cannot predict, without knowing some of the history of the interaction, whether a button press will cause it to go up or go down. what principle of direct manipulation is violated by such hidden modes?

What are the possible consequences of computer hacking? what is computer piracy? describe some examples. what are the effects of computer piracy? what are the possible consequences of computer piracy? what is intentional virus setting? describe some examples. what are the effects of intentional virus setting? what are the possible consequences of intentional virus setting? what is invasion of privacy? describe some examples. what are the effects of invasion of privacy? what are the possible consequences of invasion of privacy? what is an acceptable use policy and what is the purpose of the acceptable use policy what is intellectual property and how can you use it?