[vtkusers] Parent/Child Relationship

[Sonya Blade]

Dear All,
I'd like to know how the child parent relationship can be established for 2 or more objects? In a manner like, transformation applied to the parrent must affect all the child that the parent owns. 
Is that VTK books are available on net as pdf version? Generally it seems that they are being sold as hard copied version.
Regards, 		 	   		  
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