BOOL SetSheetName( LboxString *LString, LboxString *LNewString );
BOOL SetSheetName( LPTSTR lpSheetName, LPTSTR lpSheetNewName );
BOOL SetSheetName( long nIndex, LboxString *LString );
BOOL SetSheetName( long nIndex, LPTSTR lpSheetName );

BOOL GetSheetName( long nIndex, LboxString *LString );

long SheetCount( void );