Remotely Control Another Computer

Crossloop is one answer to controlling someone's desktop from your computer. The free version is illusive but can be found on the bottom of this page currently. How-To Geek has an explanation here. File transfer was available last time I used it.

TeamViewer works also but do not install. The user may mistakenly say yes to commercial use and their IP becomes blocked to TeamViewer. Not needs installing for TeamViewer to work.

Comodo Unite is a free VPN

Logmein is great

Ammyy no install client

Here are four options to remote desktop. It shows TV as the only one working in Win7. Not sure if true.

Another list of programs