Please Explain and help ^^

Could anyone explain the code for me please, Step by step
Thank you ,

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FUNCTION FC 3 : VOID
TITLE =
VERSION : 0.1


VAR_INPUT
rFillValue : REAL ;
iStartStep : INT ;
iEndStep : INT ;
iItemNo : INT ;
iBytesBetweenEntries : INT ;
dbDB : BLOCK_DB ;
END_VAR
VAR_TEMP
iDBNumber : INT ;
iLoopCount : INT ;
dwOffset : DWORD ;
END_VAR
BEGIN
NETWORK
TITLE =

L #iBytesBetweenEntries;
SLD 3;
T #dwOffset;

OPN #dbDB;
LAR1 P#DBX 0.0;
L #iStartStep;
+ -1;
L #dwOffset;
*D ;
+AR1 ;

L #iItemNo; //make item zero based
+ -1;
SLD 5;
+AR1 ;
L #iEndStep;
L #iStartStep;
-I ;
+ 1;
L: T #iLoopCount;
L #rFillValue;
T D [AR1,P#0.0];
L #dwOffset;
+AR1 ;
L #iLoopCount;
LOOP L;
SET ;
SAVE ;
END_FUNCTION