Is it possible to control Taskbar's properties, such as Autohide and Always On Top directly using SHAppBarMessage function? Please help.

hello everyone, I have a simple single-window program for mathematical graphing. I have seen an example somewhere of how DirectDraw is being used to accelerate drawing of MDI windows. Though I don't use a MDI app, but however, use very heavy graphing and filling I though DirectDraw could help me. I'm new to this so I was just wondering if anyone has any ideas on how to implement this? any help would be greatly appreciated. thanx.