This function loads the window or dialog procedure from a specified dynamic link library.

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

HAB      hab;            /*  Anchor-block handle. */
HLIB     hlibLibhandle;  /*  Library handle. */
PSZ      pszProcname;    /*  Procedure name. */
PFNWP    Wndproc;        /*  Window-procedure identifier. */

Wndproc = WinLoadProcedure(hab, hlibLibhandle,
            pszProcname);