In .NET, it’s easy to use Reflection to peek into other objects’ private fields (though it’s considered bad form, and of course it requires full trust). But doing the same thing in Delphi/Win32, as far as I knew, involved using the Disassembler window to find some magic numbers, and then hard-coding those magic numbers, which would be nastily brittle (and is why I never bothered).
Not necessarily so, as it turns out. Hallvard Vassbotn just posted about a Delphi/Win32 hack to write to a read-only property, using nothing but RTTI, a nice twist on inheritance, and of course some pointer arithmetic — but no hard-coded magic numbers, so it’ll still work even if you change ancestors or add more fields. Cool!