What can be linked to an Obj-C program without any particular process?

What can you do with categories?

Difference between the unsigned int and the NSUInteger?

How do you free an object?

What is a class object?

Two additional foundational building blocks of Objective-C distinct from data and procedure type foundations: ..... and Categories/Extensions?

What type of variable do you need to use to implement singletons?

Which C feature is not supported in Obj-C?

What is nil?

In Obj-C 2.0, what do the fast enumeration protocols rely on to provide fast Enumerations?

What is true regarding strings?