In article <Xns### [at] netplexaussieorg> , ingo 
<ing### [at] tagpovrayorg>  wrote:

> I do not understand, probably because I don't know what both are.

It is much like the difference between functions and declares.

    Thorsten

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Thorsten Froehlich, Duisburg, Germany
e-mail: tho### [at] trfde

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