Quick question about classes

someone posted a link ( http://qt.developpez.com/doc/4.7/widgets-calculator/ )
to that sight about making a calculator.

the question i have is about their calculator class the have the line
private slots:

does adding the "slots" actually do anything? or is it just for reference?

EDIT: Never mind, i just changed the way i was searching for the answer and i got it

http://stackoverflow.com/questions/9147636/qt-private-slots-what-is-this
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