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    <p>As Mike Spross suggests, you should use Binary Compatibility. You can (and should) build on a clean machine. You do this by keeping a copy of the current production binaries (ActiveX DLLs &amp; OCXs) in a "compatible" directory in your source control system. All the projects should refer to this copy when you select Binary Comatibility. For example, put the new binaries into ...\Release and the compatible binaries live in ...\Compatible. When the new version goes into production you copy everything from ...\Release to ...\Compatible. In this way you keep the compatibility going from one release to the next.</p> <p>When in Binary Compatibility mode, VB will create a new IID if you add a new method to your class. Remember that in COM an interface is immutable. If you make the slightest change to an interface, you are creating something new. VB observes this rule of COM, but uses some smoke &amp; mirrors to prevent breaking older client code. Because VB "knows" that the new interface is a 100% superset of the old interface (this is what Binary Compatibility ensures), it can use "interface forwarding". Interface forwarding merely redirects all references from the old interface to the new interface. Without this trick, you would have to create new versions (with different names &amp; CLSIDs) of any ActiveX component you modify. DLL Hell would turn into DLL Armargeddon!</p> <p>VB stores all the interface forwarding info in the resources of your component. When you register the component it writes all the interface IIDs to HKCR\Interface. The older interfaces will have forwarding info in them. Only the "real" interface will refer to an actual coclass.</p>
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    1. USMike Thompson
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    1. CO+1 for delving into the more technical details of how binary compatibility is implemented by VB6.
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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