You can specify whether you want a program loaded into storage above or below 16 megabytes and whether you want a program loaded at a specific address. This information along with a description of synchronous exits, the use of checkpoint restart, the use of re-entrant modules, refreshing library lookaside facility (LLA) directories, changing the LNKLST concatenation for the system, and specifying modules to be added to or deleted from LPA after IPL is described in this topic.
Load module structures, methods of passing control between programs, and the use of associated macros are described in z/OS MVS Programming: Assembler Services Guide,z/OS MVS Programming: Assembler Services Reference ABE-HSP. and z/OS MVS Programming: Assembler Services Reference IAR-XCT.