Put your code into a module in a new workbook, "Save As" the workbook as an
add-in, hide the workbook (Window / Hide), and then use Tools / Add ins...
and set the workbook as an add-in. Then you can use the UDF without
preceeding the UDF name with the name of the workbook, like personal.xls....

HTH,
Bernie
MS Excel MVP


"linzhang426"
wrote in message
...

I wonder if there is any way for me to write an user defined function so
that everytime I open a new Excel spread sheet I can use it. Something
like internal function.


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