Index [A] [B] [C] [D] [E] [F] [G] [H] [I] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [Z] QueryControl, control containment QueryInterface 2nd      AtlInternalQueryInterface          checking for IUnknown          implementation      interface maps      macros      tracing calls QueryService