Even if you're not using any new features, you should still use the newer interfaces. Even though the newer DLL's are supposed to be 100% backwards compatible, this is not always the case.
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LPDIRECTDRAW vs IDirectDraw7*
Author
is there any performance difference in using IDirectDrawSurface7* rather than LPDIRECTDRAWSURFACE? or, broader, is there any difference using the directx7 specific objects rather than the generic typedef?
-Delta Rho
I think he made a typo? LPDIRECTDRAWSURFACE is just a typedef for IDirectDrawSurface*. Same with LPDIRECTDRAWSURFACE7 and IDirectDrawSurface7*. There is no difference result-wise - but it is my belief that IDirectDrawSurface7 looks so much better that LPDIRECTDRAWSURFACE7. Heh 
- Splat
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