Making a modelless dialog, newbie question

I'd like to make a modeless form called from another form
(that is, I have two forms and one will call the other)

What property should I turn on/off to make this work ?
Thanks

Just create a Form, and call Show().

Code:

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MyFormClass newForm = new MyFormClass()
newform.Show()

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For them to communicate, you simply need to pass a reference from one form to the other... Or pass a reference a single instance of some other class...