MVS™ deletes PC routines when the task that loaded the PC routine terminates. Therefore, IBM® recommends that PC routines be loaded by a program running under the job step task of the address space that creates and owns the PC entry tables. If the program that loads the PC routine is running under a task that's subordinate to the job step task and the subordinate task terminates, the PC routine will be deleted from virtual storage. Cross memory connections to that PC routine remain, however, until the job step task terminates. If a program issues a PC instruction to invoke the deleted PC routine, the results will be unpredictable: a program interrupt may occur or other random errors may occur if the virtual storage previously occupied by the deleted program has been reused.