Well the first step is to link the tables in your AS/400 database to Access.
You do this by creating a DSN (Data Source Name) in the ODBC Administrator
in Control Panel (if you are using Windows 2000 or later then it is under
Administrator Tools in Control Panel). To do this you qill need ODBC drivers
for the AS/400 database (is it DB2?). Next you'll want to setup the Task
Scheduler to automatically run Access on the schedule you want.
"C:\Program Files\Microsoft Office\Office\msaccess.exe"
"path_and_filename_of_your_mdb_or_mde"
Next, in the Open event of your main form, run your SQL statements
Private Sub Form_Open(Cancel As Integer)
'Run your SQL - add as many statements as necessary
CurrentDb.Execute "sql_statement_or_query_goes_here"
...
'Now quit Access
Application.Quit acQuitSaveNone
End Sub