First of all i don't know english well, i am very sorry therefore... :(

I have 1055 pieces of excel file and i must add some macro them. They our
product's files and they are same files. I have a good idea then this. If i
make an add-in(xla), my problem will finish, but i must learn how can i do
OnSheetCalculate or OnSheetChange event. Becouse i want to control my files
from add-in.

Is there anyone help me about this subjuct...

I will to pray very much how help me...