Possibly the calculate event although you would have to temper it with a
static variable to only prompt with a change in the value in A1.

--
Regards,
Tom Ogilvy


"al007" wrote in message
oups.com...
I'm looking for an event macro which would inform a user that the cell
fromula result of A11 and if he wants to continue or not (ie telling
him that there is a double count)
Anybody can help???