Most of the loading functions are transparent to the user. The loader will know whether the program being loaded is a load module or a program object by the source data set type. If the program is being loaded from a PDS, it calls IEWFETCH (now integrated as part of the loader) to do what it has always done. If the program is being loaded from a PDSE, a new routine is called to bring in the program using DIV. The loading is done using special loading techniques that can be influenced by externalized options.