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a question about rendering in direct3d

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Hi My question here is about rendering in direct 3d In all the tutorials and even on msdn the way to render is like this pDevice-> Clear(......) pDevice-> BeginScene //Render here pDevice-> EndScene pDevice->Present however, i have seen another way in the book i am reading and there are more steps : 1) clear the back buffer pDevice->Clear(.....) 2) Get a pointer to the back buffer pDevice->GetBackBuffer(....) 3) Lock the back buffer pDevice->LockRect(.....) 4) Render here //Render here 5) unlock the back buffer pDevice->UnlockRect() 6) release the pointer to the back buffer pSurface->Release() 7) and then present every thing again pDevice->Present(.... so my question is, what is the difference between the two methods ? of course some steps are the same but what about locking and unlocking the back buffer ? it seems to me that BeginScene will lock the back buffer and get a pointer to it and EndScene will unlock the back buffer and release the pointer . is that true ? the interesting thing is that in the first method, when i put a code to exit the program when i press the escape button , the responce was slower and if i don't show any thing on the screen then i have to press escape many times before it does something while this was not the case in the second method so if any one can explain to me about this, i will appreciate it Thanks

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