LERAD and SYNAD operate in the same mode (TCB or SRB), state (problem or supervisor), and key as the part of the program that issued the RPL-based or CHECK macroinstruction whose issuance caused the LERAD or SYNAD exit routine to be invoked. Thus, LERAD and SYNAD operate essentially as extensions to that part of the program, and are subject to exactly the same interrupt conditions and other operating system rules as that part of the program.

LERAD and SYNAD need not directly return to VTAM®. Instead, they can branch to another part of the application program, still operating as an extension to the original part of the program from which they were invoked. If they do return to VTAM, VTAM then gives control to the next sequential instruction after the original RPL-based or CHECK macroinstruction.