Hmmm, in that case, I'll give you my poor summary but you'll have to look for tutorials to get it a 100%
There's an option to split a single database file (mdb/accdb) into a Front End/Back End combo. The front end will contain the forms and reports, the back end will contain the tables and relations. Of course the forms will be linked to their tables normally just like they would if it were a single database.
This way, you can have multiple versions of the front end (make many copies and edit them) while the backend has no clue of what's going on. So now, you can have a certain front end for normal users, and another one for admins (which you will keep for yourself by password or whatever).
Of course you can then make the mdb file into an mde (or accdb to accde). This will basically not allow changes to be made to it's design.
Hope that helps