Back to My Mac - Multiple computers

Question

Hello,
like many people on here I am the "home network administrator" wfor my wife, parents, youngin's etc...
We also tend to travel, so often we're not in the same home or even the same city/state.
I don't want them all logged in and syncing to my iCloud account, but I would like to be able to use Back to My Mac to help with random issues, and such as they come up.  Is there a way for me to set this up, so that they can all be using their own AppleID's for iCloud, iTunes, etc... for day to day, but that I can still remotely help them when needed?  I'm the center of contact for issues, system updates, etc.. 
none of them run as an administrator account, so I can sometimes help them using the screensharing through iChat, but then I can't really log out, and back in again.
It would be very nice to be able to connect into my account on their machines to troubleshoot stuff, do updates, etc...
Anyhow, any advice would be greatly appreciated!
Everyone is Running Mac OS X 10.7.x   (10.7.2 & 10.7.3at the time of posting this)

Answer 1

In Message in 10.8 , in preference, in alert, select invitation to share your screen
and select the applescript that you will create with the script below
You are going to have to enter the name of the account that you allow to control the computer
in the line
  set membreDeLaFamille to {“Name FirstName”, ”Name FistName”}
in my case, it was Name Firstname but it depand on what t show on the Aim Windows
Saddly, this system is gone in 10.9
very very sad
using terms from application "Messages"
          on received text invitation unTexte from unePersonneQuiAppelle for leChat
                    if verifieLaPersonne(unePersonneQuiAppelle) then
  accept leChat
                    end if
          end received text invitation
          on received audio invitation theText from unePersonneQuiAppelle for leChat
                    if verifieLaPersonne(unePersonneQuiAppelle) then
  accept leChat
                    end if
          end received audio invitation
          on received video invitation unVideo from unePersonneQuiAppelle for leChat
                    if verifieLaPersonne(unePersonneQuiAppelle) then
  accept leChat
                    end if
  delay 5
                    tell application "Messages" to activate
                    set zoomed of front window to true
          end received video invitation
          on received remote screen sharing invitation from unePersonneQuiAppelle for leChat
                    if verifieLaPersonne(unePersonneQuiAppelle) then
  accept leChat
                    end if
          end received remote screen sharing invitation
          on received local screen sharing invitation from unePersonneQuiAppelle for leChat
                    if verifieLaPersonne(unePersonneQuiAppelle) then
  accept leChat
                    end if
          end received local screen sharing invitation
          on received file transfer invitation theFileTransfer
                    if verifieLaPersonne(unePersonneQuiAppelle) then
  accept theFileTransfer
                    end if
          end received file transfer invitation
end using terms from
on verifieLaPersonne(laPersonneQuiAppelle)
          set utilisateurSecuritaire to false
          set membreDeLaFamille to {“Name FirstName”, ”Name FistName”}
          set leNomDeLaPersonneQuiAppelle to name of laPersonneQuiAppelle
          repeat with i from 1 to number of items in membreDeLaFamille
                    set unMembreDeLaFamille to item i of membreDeLaFamille
                    if leNomDeLaPersonneQuiAppelle = unMembreDeLaFamille then
                              set utilisateurSecuritaire to true
                    end if
          end repeat
          tell application "System Events"
                    set ss to current screen saver
  stop ss
          end tell
          return utilisateurSecuritaire
end verifieLaPersonne