can you explain multi(0)

[ahmed_hady]

iam happy to be member in this forum
i love all of you here

please can you explain what multi(0) means in the boot files

I searched on it but didn't get any sufficient answer and this information dosnt enough to make me know what function of multi(0) in the boot file
can you explain multi(0) for me if you dont mind ?

 

[StrangleHold]

multi(x)

http://www.computerhope.com/issues/ch000492.htm