You won't be able to change the design of tables, and possibly not even access the same table at the same time (unless you use forms with sql and recordsets), but try this:
Copy the table, and paste it in the same place, with the name Tables.mdb or something.
In one of the copies, delete all the forms, queries, reports and modules (leaving just the tables). In the other one, delete all the tables, go to File -> Import External Data -> Link Tables, browse to the other copy, and double click on it. Select all the tables and click OK.
Now, leave the version with the tables in the same place, and move the version without - place one copy of this in the local area for each user. You will now only be allowed one user to login to your local version (of which there are many), but all the users are accessing the same tables.
Hope this helps.