Use the Open event if you may need to cancel the opening of the form.
Other than that, it doesn't really matter which you use.
If you plan to alter the RecordSource or apply a filter, it might make sense
to do that in the Open event, since that usually fires before Load.
If your question means you want to know what kinds of things you might need
these events for, here's an example:
http://allenbrowne.com/ser-56.html
--
Allen Browne - Microsoft MVP. Perth, Western Australia
Tips for Access users -
http://allenbrowne.com/tips.html
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When should the open event and load event on a form be used?