Hi,
I have heard about a software don`t know the name but by using that software we can share the screen of a computer which a long distance away... the only requirement is both the computer`s should be connected to the internet... if that is true can v upgrade or download such software

Take a look at the first link -- think this is what you want

Bosco’s Screen Share

Second link is search I did to find it

that software we can share the screen of a computer - Google Search

Rate my answer if it helps