> the first one is how to set the button position?please give me a example!
> (maybe i want it be located in the center of the window )

This one can sometimes get a little confusing, so I'm sure someone else can 
give a better explanation than me  ^.-

> the second is how to play a mp3 in the program ??
> i want my program has a backgroud audio!

Rebol (as far as I know) only supports certain types of WAV files right now

> the third one is not on vid ,it is about "request"
> this function has a refinement called type ,we can see it by using "help
> request"
> help request
> request argument /type icon
>
> icon--can be info ,help (default),alert
>
> but why the code can not work:
> request/type "your age?" info
>
> the rebol told me that type need a "word!" argument !

request/type "You age?" 'info

The single apostrohpe ' in front of the info designates it as a word. 

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