I would like to see which user(s) is/are currently viewing the app on User > Login Security > Login Activity on my account.

Version 1:

 Every time a user logs in or opens app, update the time stamp on Login Activity. This doesn't do this   already. I think it's set to once a month/year or something.

 Version 2: 

 Use sockets to have a live feed of who is currently using the app on your account.