i have a question fom my vb book that i cant quit understand..can u help me solve it? it says

.....You have a form with two listbox controls on it. you have a textbox control to allow the ddate entry clerk to enter in the names. you have a button to add the names from the textnox to the first listbox. the first listbox could be set to multiselection to allow the company boss to select multiply names.you know hahow many items are in the list using the litcount property. you create a sub that taes an integerfor an argument representing the index of the list item. the sub then checks if this item in the first listbox has been selected copying it to the second listbox.....