Generally the best method of doing this would be for the class to raise some
sort of event or callback. So instead of the class having specific knowledge
of the form (eg, having the line MyForm.Label1.Text = "50% complete") it
would raise an event and the form would set the label caption. This might
seem like a minor difference but it makes the class more independant of the
form and the class could be called from several different forms, or maybe
one day from a webpage or PDA or even a console app.
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