These meeting tools have these features.

• Allows screen/desktop sharing in real-time, so trainer can show the presentation or application to student
• Trainer can make trainee show his/her desktop to see if he/she is having any problem to do certain tasks
• Trainer and trainee can share mouse or keyboard control of each others machine
• provides a conf call (US number) for the meeting. International users can use skype/yahoo to call.
• Yugma (freely availble from yugma.com) or Unyte (availble from unyte.net) or GotoMeeting Trainer may use other tools like WebEx
• Unyte is the best for the free product category. Gotomeeting is the best in the paid product