Applications often have single row tables to store things like app or user parameters. A common method to ensure the table only has one record is to set up a numeric field (perhaps “ParamID” as type Long) and set as the Primary Key. Set the Default Value for the table to 0, the Validation Rule for that field to =0 and set some Validation Text such as “Only one record allowed in this table.”
If the app has both an AppParam table for general settings and a UserParam table for user-specific setting you could combine them as one row in a query by creating a temporary field in the query that is only used to join the two tables together.
SELECT sp.*, up.* FROM ( ( SELECT *, "A" as addedField FROM SysParam) AS sp INNER JOIN ( SELECT *, "A" as addedField FROM UserParam) AS up ON sp.addedField = up.addedField )