This function adds an entry to the Window List.

#define INCL_WINSWITCHLIST /* Or use INCL_WIN, INCL_PM, */
#include <os2.h>

HAB         hab;               /*  Anchor-block handle. */
PSWCNTRL    pswctlSwitchData;  /*  Switch data. */
HSWITCH     hswitchSwitch;     /*  Handle to the newly created Window List entry. */

hswitchSwitch = WinCreateSwitchEntry(hab,
                  pswctlSwitchData);