Warhammer 40k Winter Assault Trainer

[supercharge]

Hi all,

I was reading this tutorial and had no idea how he knows it's the right address. Can some experts here point it out, please?
How about some tips on finding the locations for users only, not computer?

Here is the part:

...
ADDRESSES....  OPCODES............ ASSEMBLY LANGUAGE.........

017F:60570C50  55                  PUSH    EBP
017F:60570C51  8BEC                MOV     EBP,ESP
017F:60570C53  A1E8625E60          MOV     EAX,[605E62E8]
017F:60570C58  8B08                MOV     ECX,[EAX]
017F:60570C5A  FF15E4625E60        CALL    [605E62E4]
017F:60570C60  8B4854              MOV     ECX,[EAX+54]
017F:60570C63  85C9                TEST    ECX,ECX     
017F:60570C65  7508                JNZ     60570C6F   HOW DOES HE KNOW THIS IS THE ADDRESS OF BULLETS?
017F:60570C67  8B4508              MOV     EAX,[EBP+08]   <--- Address of BULLETS
017F:60570C6A  8B4D0C              MOV     ECX,[EBP+0C]   <--- Amount of BULLETS to
                                                               decrease by.(ECX=1)
017F:60570C6D  2908                SUB     [EAX],ECX      <--- subtract ECX(1)from BULLETS
017F:60570C6F  5D                  POP     EBP            <--- WE LAND HERE WHEN SI POPS
017F:60570C70  C3                  RET

Thanks all.