[PyQt] a newbie pyqt question, the pyqt book related

[lotr py]

Hi, Sorry for my bad english and PyQt skill.
I am reading the book "Rapid GUI Programming with Python and Qt The
Definitive Guide to PyQt Programming", my question is related to
chap08/mymovies.pyw.
near the end of MainWindow.updateTable() there is
        if selected is not None:
            selected.setSelected(True)
            self.table.setCurrentItem(selected)
            self.table.scrollToItem(selected)
what I want to ask is, what's the mean of "selected.setSelected(True)",
isn't self.table.setCurrentItem(selected) enough here?
Thank in advance for your reply.
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