Macros don't run when a user edits a cell. You could use the change event
to review what was entered and change it.

http://www.cpeason.com/excel/events.htm

--
Regards,
Tom Ogilvy

"Terry Lowe" wrote in message
...
I need to replace keystrokes the user types in cells of a spreadsheet. For
example, if they type a period "." I want to replace it with a colon ":".
I've tried combinations of OnKey with SendKeys but I cannot get it to
work.
Does anyone have any suggestions on how to do this? Thanks.