Use

[Jonathan Morton]

>I know that VNC can be used for private home use free
>of charge.
>Can you inform me what about commercial use.

Home or commercial use, it's all free.  Or, more precisely, Free. 
(The capitalisation denotes freedom as in speech, as opposed to 
merely free as in beer.)

The main exception is TridiaVNC Pro, which you do have to purchase 
from Tridia, but they can explain about that for themselves.  In that 
case, you're paying for support and extra features, not for VNC 
itself.

-- 
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from:     Jonathan "Chromatix" Morton
mail:     chromi "at" chromatix.demon.co.uk
website:  http://www.chromatix.uklinux.net/
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