<span>You can install several printers on your machine, but at least one must be the default printer. When you have several machines attached to your computer, it is important to designate one of them as the 'default' machines so as to avoid confusion within the system. If you fail to do this, you may create some problems, so be sure to choose a default one.</span>
If it is guranteed the key is only known to Alice and Bob and there is no risk of man in the middle attack or channel spoofing so we can achieve data origin authentication
