Use the shell command.
Private Sub cmdOpenDB_Click()
On Error GoTo Err_cmdOpenDB_Click
Dim stAppName As String
stAppName = "C:\Program Files\Microsoft Office\Office\msaccess.exe " & "u:\Access\FolderName\DBName"
Call Shell(stAppName, 1)
DoCmd.Quit
Exit_cmdOpenDB_Click:
Exit Sub
Err_cmdOpenDB_Click:
MsgBox Err.Description
Resume Exit_cmdOpenDB_Click
End Sub
Change path to suit.
David