This example shows a message for every element in a listbox that
has been selected by the user.
procedure TForm1.Button1Click(Sender: TObject);
var
Loop: Integer;
begin
for Loop := 0 to Listbox1.Items.Count - 1 do begin
if Listbox1.Selected[Loop] then
ShowMessage(Listbox1.Items.Strings[Loop]);
end;
end;