It is not 100% clear here if you want to know that the user is all done with
the field, and has hit enter to move on.
It your case is the above, then I would suggest you use the after update
event.
If you want to change the behaviors of the enter key in a field, then there
is a setting in the "other" tab that will change the behaviors of the enter
key one setting = go to next field,
and the other setting = Enter = new line of text.
If your problem NOT solved by either of the above, then you can trap, and
process the entry key in the on-key down event.
You can use:
If KeyCode = vbKeyReturn Then
KeyCode= 0
msgbox "you pressed the enter key..ha ha!"
end if