Could be as simple as adding a level or sort field to the table and modifying the query to show everything < that value, which is in a hidden form text box, for example. Or the query could call a function which does the same (preceded by an operator such as < but I'm not sure if the operator and returned function value are compatible). One could use a Select Case block to run the appropriate qry or sql statement on form open. Or the aforementioned level could be linked to the user table. Many ways to skin this cat. For what it's worth, I use fosUserName, not the environ value.
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.