common-graphics on MS Windows

Hi all,

I have been reading the common-graphics doc, but still could not find  
answers to these questions:
1) how do I get the z-order of windows?
I need it because I need to know if a window is in front or behind  
another window. I can probably fake it by handling the wm_activate  
message, but I'd rather not unless it's necessary.
2) how do I create a basic-pane (or any undecorated window), without  
having it show in the Windows taskbar?

Any help would be greatly appreciated. Thanks.

--ron