presuming you have a split database with each user having their own
frontend....one doesn't need to shut down / restart - but one does have to
refresh.
data is pulled in when opened...ie. a form, combobox, query etc......
for the data to be updated that form/query (generically speaking "object")
must refresh. you can close and reopen that object or in code make the
object refresh/requery.
Access is event driven. So you must figure out a trigger to
refresh/requery, maybe a timer, or maybe - as I do - just explain to users
they must close and reopen.