#include "shellapi.h"

APPBARDATA abd;
abd.cbSize = sizeof(abd);

SHAppBarMessage (ABM_GETTASKBARPOS, &abd);

switch (abd.uEdge)
{
   case ABE_TOP: 
        AfxMessageBox ("Taskbar is at top");
        break;

   case ABE_BOTTOM: 
        AfxMessageBox ("Taskbar is at bottom");
        break;

   case ABE_LEFT: 
        AfxMessageBox ("Taskbar is at left");
        break;

   case ABE_RIGHT: 
        AfxMessageBox ("Taskbar is at right");
        break;
}