IDG Contributor Network: Use the Messages app to share your Mac's screen in OS X

OS X has many useful but nearly unknown features that are missed by many users. And one of the most helpful is the ability to share your Mac's screen via the Messages app in OS X. Yes, it's actually possible for the family member or friend you are chatting with in Messages to see your Mac's screen or vice versa.This can be particularly useful if your friend or family member is having trouble with something on their Mac, and wants your advice on how to use it or fix it. They can show you their sc