Yes, for 3D to use this technique it needs a single call (Texturing.Include), which specifies an additional texture and (optionally) whether to use environment mapping. There are two examples that illustrate the effect (Multi-texturing and Skies).

For 2D, there is TMultiCanvas which uses up to 8 textures to render the image (for effects like adding alpha-channel and render target together). There is also example which illustrates this effect (PaintDrops).

Any specific reason why you are asking?