Why do you need to update all your queries? This requirement is unusual. Commonly people write queries that drive forms, and then allow the user to filter said forms in various ways. It seems unusual to need to update all the WHERE clauses as a batch.
One idea is to use parameters in your queries that draw data from open forms. In a case like this the user edits the value in the form, and opens the query. The query reads the value from the form, and done. No need to edit the criteria directly, because the query looks to the open form for data. But again, what are you trying to do? Show your work.
hth
Mark