Access uses record locking to prevent simultaneous changes to the same record. Almost always, more than one record is locked -- the one being edited, and adjacent records up to a page size -- about 32kb (can be more or less, depending on the version of Access). Bottom line, only one user can edit a record at a time.
BIG topic! There are many security options out there, but Access has a pretty good user-level security model, based on work groups. For both of these topics, check the Microsoft Knowledge Base.
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