If there is someone who knows how to use it...please explain.I don't understand how the hex value affects the changes,and what is going on exactly.

This should help: http://msdn.microsoft.com/en-us/library/4d3eabky(v=vs.80).aspx

It actually helped a lot.Even though the book I'm reading doesn't use that macro,it just uses a hex value to specify what and where to move,I understand it now.Thanks a lot!



But that is how the data looks in a register? It's read from right to left?
I thought only the shuffle command is read from right to left.

you know,if you'd give a shuffle command like 1,3,5,9 it would be read 9,5,3,1.But the data in the register is also put from right to left?

I mean does it look like this?
127.................................0 ?