In this example, the WinQueryWindowUShort call is used to query the window words to see if a window has been minimized.

#define INCL_WINWINDOWMGR
#include <OS2.H>

HWND   hwnd;
USHORT usResult;

usResult = WinQueryWindowUShort(hwnd, QWS_XMINIMIZE);
if (-1 == (LONG)usResult)
{
  /* Window has not been minimized */
}