As noted in my comment, Base is not “Web” oriented. Anyone accessing your data will do it using an IP and not the browser. Also they need to have LO installed on their system along with your specific form and queries if designed that way. They connect to your server to get the data and nothing else.
All this about closing everything is in the hands of the user. Only item on your part is if someone is connected to the server accessing the data. You simply have the database.