A family of Microsoft relational database management systems designed for ease of use.
Ouch!
You will need to construct a DSN to the SQL Server or construct a query that links to the server.
In the VBA window, enter the following.
?currentDb().TableDefs("nameOfALinkedTable").Connect
Copy and paste the connection string (remove password and UserID if there). That will tell me how you are connected to the data on the server. You will need that connect string to set up your passthrough queries.