How do you/do you tell a 6 year old they have Aspergers?

[Jerbil]

one train of thought from the Community Paediatrician is that it may reduce some of his anxiety because he may be able to think "I only have that fear/problem because..."

Just don't know how to go about it and want to draw on your experiences/opinions.

Thanks

I have a great wee book called Making Sense of Aspergers: A Story for Children by Debra Ende which essentially makes an analogy to computer operating systems (my ds is 7 and could very much relate to computers) with pc's operating on Windows and Apple's operating on Mac OS. Both make the computer work but each system works in a different way.