Is there a VNC app or something, so I could securely connect fromy my iPad to my MacBook? By 'securely' I mean it won't be unlocked when I'm connected to it. I don't want anyone who is around my computer (e.g. at work) to see what I do on my computer or to have a full access to my Mac in general. Is there an app that can blank the screen (and possibly lock local keyboard and mouse input)? I know for sure LogMeIn can't do this (when using Mac as a host). I've read that Screens app might have this feature but there's no official info about it. Thank you.