A family of Microsoft relational database management systems designed for ease of use.
There's a file Refresh.zip in my public databases folder at:
http://cid-44cc60d7fea42912.skydrive.live.com/redir.aspx?resid=44CC60D7FEA42912!169
which includes demonstration databases for automatically detecting invalid links at start-up in both single of multiple back-ends. In the case of the latter a multi-select list box shows which links are broken and allows multiple items to be selected to browse to and refresh the links for each subset of tables.