This function initializes the PM facilities for use by an application.

#define INCL_WINWINDOWMGR /* Or use INCL_WIN, INCL_PM, Also in COMMON section */
#include <os2.h>

ULONG    flOptions;  /*  Initialization options. */
HAB      hab;        /*  Anchor-block handle. */

hab = WinInitialize(flOptions);