you would need to use a sql statement something like
update employeetable set status = whatever where employeeid = listboxvalue
you do this by
docmd.runsql statement
or currentdb.execute statement
the statement has to be formatted properly or it will not work
after executing the statement then
listbox.requery will requery the listbox contents (if you are displaying the logged in status.
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note that you cant update the listbox directly - the listbox is drawn from a query, and therefore you have to amend the table(s) which underly the query to affect the lsit box.