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what is meant by system functions ...............................

Those function tell you more about the application itself and data being used than make any calculation.
As you see you can get information about the app:like author, document name or version of Qlikview
You have two great resources for over viewing the available functions in QlikView.
QlikView Reference Manual - Delivered as a PDF
QlikView Desktop Client Help - Press F1 in the client to access this
As a beginner in QlikView I would strongly advise that you at least browse through the reference manual, to get a flavor of it's content and value.