how to know Gen ID of the items dropped by the mobs?

[werty]

how to know Gen ID of the items dropped by the mobs?
which one need to edit? GENNUM or ITEMSPEC?

//¹ß»ýÈ®À² %
GENRATE 50.0
//¹ß»ý°¹¼ö °³¼ö [max:5] %sum=100%
GENNUM 3 98
GENNUM 2 2
//¹ß»ýÁ¾·ù Á¾·ù [max:10] %sum=100%
ITEMSPEC 2 25 //¾àÇ°B
ITEMSPEC 191 40 //Ãʱ޿¬¸¶Àç(ÀÏȸ¿ë½¡µ¹,ÄÚÆÃÁ¦)
ITEMSPEC 196 16 //ÀúÇ×Á¦
ITEMSPEC 198 7 //RARE¹«±â
ITEMSPEC 599 2 //RAREº¹Àå
ITEMSPEC 598 10 //RAREº¹Àå
//ITEMSPEC 24 0.5 //ÀϹݹ«±â
//ITEMSPEC 410 0.75 //ÀϹݺ¹Àå
//ITEMSPEC 175 3 //SKILL¹®¼­ 5µî±Þ
//ITEMSPEC 208 1 //ºóº´
//ITEMSPEC 237 1 //±ú´ÞÀ½ÀÇ ¿­¼èÁ¶°¢
//ITEMSPEC 238 3 //³ªÇÑÀDZ¸½½
//ITEMSPEC 239 2 //¸¶·çÄ¡±â¼­Æĺ»
//ITEMSPEC 556 20

[MentaL]

[geger009]

read this

[werty]

GENNUM 4 50 >>>>>> 4 for what? 50 for 50% drop right?
GENNUM 6 30
GENNUM 8 20

ITEMSPEC 2 25 //¾àÇ°B
ITEMSPEC 191 40 //Ãʱ޿¬¸¶Àç(ÀÏȸ¿ë½¡µ¹,ÄÚÆÃÁ¦)
ITEMSPEC 196 16 //ÀúÇ×Á¦

which 1 is item drop? gennum or itemspec?

[navirius]

gennum for quantity chance

itemspec for kind of item chance drop

[nizarrahmat]

GENNUM 4 50 = 4 item drop by mobs 50%
GENNUM 6 30 = 6 item drop by mobs 30%
GENNUM 8 20 = 8 item drop by mobs 20%

ITEMSPEC 2 25 = Item Drop by mobs item code 2 25%
ITEMSPEC 191 40 = Item Drop by mobs item code 191 40%
ITEMSPEC 196 16 = Item Drop by mobs item code 196 16%

U can see itemcode in item.isf
like this
http://imageshack.us/photo/my-images/687/itemcodey.jpg