IDirectDrawSurface4::UpdateOverlayZOrder

DDraw vtable[35] → HRESULT

IDirectDrawSurface4::UpdateOverlayZOrder is a method of the COM interface IDirectDrawSurface4 in DirectDraw. Its function pointer sits at vtable index 35 — the zero-based slot in that interface's virtual method table, counted from QueryInterface and including every entry inherited from a base interface. It takes 2 parameters (flags, reference_surface) and returns HRESULT.

COM methods are reached through that table rather than by an exported name, so the slot index is what a wrapper, an interface hook or a disassembly listing has to resolve against. The parameter order and types below are the ones this interface declares.