When to use instance variables and when to use properties

Question

When using Objective-C properties can you stop creating instance variables altogether or do explicit instance variables (not the ones synthesized by the properties) still se

Answer 1

This question was addressed before here

When you use synthesize the instance variables are handled and instantiated for you. If you're using Lion with the new version of XCode also take a look at the various properties in ARC in Transitioning to ARC