DSN 

Short for Data Source Name. Data Source Name provides connectivity to a database through an ODBC driver. The DSN contains database name, directory, database driver, UserID, password, and other information. Once you create a DSN for a particular database, you can use the DSN in an application to call information from the database.
There are three types of DSNs:
(1) System DSN -- can be used by anyone who has access to the machine. DSN info is stored in the registry.
(2) User DSN -- created for a specific user. Also stored in the registry.
(3) File DSN -- DSN info is stored in a text file with .DSN extension.
DSN is often used by Active Server Pages (ASP) and Visual Basic programs when a query to a database is necessary to retrieve information.
There is also what is known as a "DSN-less connection." Instead of using a DSN to connect to a database, the developer specifies the necessary information right in the application. With a DSN-less connection the developer is free to use connection standards other than ODBC, such as OLE DB.


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If you are using a Workgroup (System database):

oConn.Open "Driver={Microsoft Access Driver (*.mdb)};" & _ 
           "Dbq=c:\somepath\mydb.mdb;" & _
           "SystemDB=c:\somepath\mydb.mdw;", _
           "myUsername", "myPassword"
 

If want to open up the MDB exclusively

oConn.Open "Driver={Microsoft Access Driver (*.mdb)};" & _
           "Dbq=c:\somepath\mydb.mdb;" & _
           "Exclusive=1;" & _
           "Uid=admin;" & _
           "Pwd=" 
 

If MDB is located on a Network Share

oConn.Open "Driver={Microsoft Access Driver (*.mdb)};" & _
           "Dbq=\\myServer\myShare\myPath\myDb.mdb;" & _
           "Uid=admin;" & _
           "Pwd="
 http://www.codemaker.co.uk/it/tips/ado_conn.htm