I have a workbook with many tabs, and the number often changes. Most
of these tabs have columns that need to call code when certain cells
change. The code in incorporated into another workbook that is always
opened.

I call the code by placing a Worksheet_Change event hander VBA macro
in every sheet. The problem is that if the macro changes, say it moves
to a different workbook or the API changes, I have to go to all of the
sheets and change the code that calls it.

Can I put this event handler somewhere else? Does the _change message
"bubble up" to some higher layer, like ThisWorkbook?

Maury