Binary compatibility

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<@QueenDee> When you compile a COM control, it gets given a unique ID
<@QueenDee> when something uses that, it uses that unique ID
<@QueenDee> so, when you change the control, you need it to keep that same
            ID so you dont need to recompile everything that uses it
<@QueenDee> if you DONT have compatibility set, it will be different each
            time
<@QueenDee> If you do, it will make sure your objects and interfaces use
            the same ID as those in the compatible file

See also

• http://www.visibleprogress.com/vb_binary_compatibility.htm
• http://www.techieone.com/detail-11643172.html