This example calls WinSwitchToProgram to make a window the foreground process.

#define INCL_WINSWITCHLIST
#include <OS2.H>

HAB     hab;
HWND    hwndFrame;
HSWITCH hswitch;

hswitch = WinQuerySwitchHandle(hwndFrame, 0);

/* Switch to the window defined by hwndFrame */
WinSwitchToProgram(hswitch);