Call a function when a cell changes

[henpat]

Good morning/afternoon

I need to execute a function only when the cell "B4" change of value.
How can I do it?
Thanks in advanced
(Office 2003)

henpat

 

[Tom Ogilvy]

What causes cell B4 to change value

User edits the cell?

There is a formula that may change on a calculate

this is a DDE Link

Some code changes the cell

Something else.

In any event, you can begin looking a worksheet level events like Change and
Calculate.

See Chip Pearson's page on events to start (if not familiar with them)
http://www.cpearson.com/excel/events.htm