Yes, the table to be modified is in the active workbook.

Tim Williams wrote:
Your only solution is likely to be to use something along the lines
of
an event procedure (such as "calculate") instead of a UDF.


If F() is called from an add-in, then where is the table to be
modifed? In the activeworkbook?

Tim.


wrote in message
oups.com...
I understand that functions can only modify the cell they are called
from. However, if anyone has a solution to this problem, I would
greatly appreciate it.

A function F(N) does a vlookup in a table and returns a value.

If it cannot find N in the table, I want to add N to a list in
another table.

F() is called from an addin if that is relevant.

Any creative solution appreciated.

Thanks
Jeff Stryer