Option Explicit
Sub Auto_Open()
msgbox "Hi from TraciLea"
End sub

If you're new to macros:

Debra Dalgleish has some notes how to implement macros he
http://www.contextures.com/xlvba01.html

David McRitchie has an intro to macros:
http://www.mvps.org/dmcritchie/excel/getstarted.htm

Ron de Bruin's intro to macros:
http://www.rondebruin.nl/code.htm

(General, Regular and Standard modules all describe the same thing.)

TraciLea wrote:

When an excel spreadsheet is opened, can I have a custom message pop-up for
other users? It is for documentation control.

--

Dave Peterson