Installation and sharing of the apps

Hi

With Windows 8.1 Update, if I wanted to install an app and share it among all users of the same computer, what would be the best method?

How do I update these shared apps?

Is it possible to share an app (already installed) between two or more accounts belonging to the same computer? If so, it is also possible to maintain separate the settings of these apps for each user?

Thanks

Bye