how many instance will a shared variable be created? just 1 correct?

Hi :
How many instances of a shared variable will be created in a class? just one? correct

Code:

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Public Class DocumentDelivery
    Implements IDisposable

    'A rendered list that contains the rendered documents
    Public Shared RenderList As List(Of Byte()())

End Class

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So, in other words, the DocumentDelivery class will only have one instance of RenderList, correct? can somebody confirm?

correct. And all instances of DocumentDelivery (if any) would share it, as any piece of code that can access it through DocumentDelivery (class itself).
Beware of multithreading on a multiprocessor machine, though: it might ruin your day...

why? if I never intend for this to run in a multi threaded environment...

then you should have no matters.