- Access-DRG/2003, which should run under MS-Access 2000, 2002 and 2003. This is the good old ".mdb" version
- Access-DRG/2007, which should run under MS-Access 2007. This is the new-fangled ".accdb" version
Note that this product is more-or-less useless without the VB-callable DLL, but the current VB-callable DLL is included with your Access-DRG purchase.
In the normal course of events, we expect you to buy Access-DRG once and VB-DLL subsequent year. You only need to buy Access-DRG again if and when Microsoft changes MS-Access enough to require a new app.