This example calls WinQuerySwitchHandle to get the Task List handle of a frame window, and then calls WinQuerySwitchEntry to retrieve information about that application.

#define INCL_WINSWITCHLIST
#include <OS2.H>

HAB     hab;
HWND    hwndFrame;
HSWITCH hswitch;
SWCNTRL swctl;

hswitch = WinQuerySwitchHandle(hwndFrame, 0);
WinQuerySwitchEntry(hswitch, &swctl);