A possible way to do this (only display the warning message one time for the
entire life of the workbook) is to add a Sheet (at the end of your existing
sheets is fine), put your message on that sheet along with an OK button and
then hide all the rest of the sheets. Put the code for the OK button on this
"added message" sheet and have it unhide all the hidden sheets, then
activate one of those now unhidden sheets, then have that code delete the
sheet with the message on it and, finally, save the workbook so the
"message" sheet and the OK button code are gone forever.

--
Rick (MVP - Excel)


"John" wrote in message
...
Hi Everyone
Is it possible to have a popup window ( Msgbox ) that will open only one
time.
The first time the workbook will be open, I would like to show the message
"Please read the instruction first".
I don't want the message to keep opening every time the workbook is open.
Regards
John