Field help (APSACS) 

This access code makes it possible to prohibit access to the current record for some users.

As a matter of fact, if the field is completed, only the users having this access code with read rights (respectively write rights) can view (respectively modify) the concerned record.

This access code makes it possible to prohibit access to the code for certain users.

If the field is assigned, only those users who have this access code in their profile can modify and/or enter this code according to the rights accorded.