How to use ini file?

Hi All,

 Can anybody please tell me how can i use ini file for storing and retriving data from it?
I have created a sample Application using wizard with ini file support, i have these following function in my Document class.

void RestoreL(const CStreamStore& aStore, const CStreamDictionary& aStreamDic);

void StoreL(CStreamStore& aStore, CStreamDictionary& aStreamDic) const;

CFileStore* OpenFileL(TBool aDoOpen,const TDesC& aFilename,RFs& aFs);

I don;t  know how to use these functions.

Regards
Chetana Patil