Access VBA code: Pressing Esc to run code and exit the form

Hi,

I have a form which records via a barcode scanner products purchased for an honesty bar. In the old system after scanning the items wanted you hit the Escape key which recorded the purchases against your account and logged you out.

Do I use the "On Key Press" Event within the purchsing form and if so how do I tie the code to the pressing of the Esc key?

Thanks in adavnce.

Jon