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FUNCTION xpfGetQueryPerformanceCounter : INTEGER;  
(* wrapper for
Widows function:     	BOOL WINAPI QueryPerformanceCounter(     									_Out_ LARGE_INTEGER *lpPerformanceCount    
                                    );
*)


FUNCTION xpfGetQueryPerformanceFrequency : INTEGER;  
(* wrapper for Widows function: 
	BOOL WINAPI QueryPerformanceFrequency(
                                          _Out_ LARGE_INTEGER *lpFrequency
                                         );
*)

See Windows documentation for description


FUNCTION xpxGetQueryPerformanceUsed (startTime        : INTEGER;
                                     endTime          : INTEGER;
                                     VAR hours        : INTEGER;
                                     VAR minutes      : INTEGER;
                                     VAR seconds      : INTEGER;
                                     VAR milliseconds : INTEGER;
                                     VAR microseconds : INTEGER)
                                     rstat            : INTEGER;

This functions calculate the time difference between to time stamps returned by the xpfGetQueryPerformanceCounter function.