I remember working in the past at workplaces big enough to have their own hurt desks and having my computer taken over by someone else in an attempt to solve some problem I had. That's made me wonder what the equivalent Linux software is. I wouldn't have to run that software on my DSL laptop, but could run it on my Fedora desktop, taking over the other DSL laptop over the Internet.
I'd be very grateful if someone could recommend any such software, just to get me started.
Windows works very differently to linux (or any system using the X Window System) in this respect, which makes this fairly difficult to do. However, recent versions of GNOME (2.8 or later I think), have a native port of VNC tied into the X server. If you are running a recent GNOME version (I can't tell you how to check that under Damn Small Linux though), you can access this by logging in as the user, clicking on the "System" menu, then the "Preferences" menu, then "Remote Desktop". Enable 'Allow other users to access your desktop' and 'Allow other users to control your desktop'. Set 'Ask you for confirmation' and for safety's sake, set 'Require the user to enter a password' and set a password. For you to connect, you'll need to use a program suite called VNC. The linux version is normally called xvncviewer. You'll need to know her remote IP address, and if she has a firewall then port 5900 will need to be opened up to allow traffic through to her workstation.