Helpdesk
Helpdesk is a kind of software to help computer users fix their problems remotely. Nowadays many corporations provide helpdesk support for customers and prospectors.
The user notifies the helpdesk of the own issue, and the helpdesk software creates a detailed ticket for the problem and forward the user to actual solution or fix. Also the helpdesk allows personnel to performs remote assistance to the user using remote access software.
Helpdesk using Remote Desktop Control
Remote Desktop Control allows a support team to take over a remote desktop and quickly fix any problems on the user's computer. Software is an optimal solution for troubleshooting computer problems remotely.
If somebody doesn't know how to use some software or to do some task, simply connect to his computer and configure everything as you need. The user will be able to observe your mouse clicks and other manipulations to learn how to work with software!