Figure 1 illustrates the environment in which the new address space will be a service provider.

Figure 1. An example of a cross memory environment

In this figure, programs PROG1 and PROG2 in the creating address space can use the PC services PCRT1 and PCRT2 provided by the new address space.

To set up the cross memory linkages for this environment in Figure 1, cross memory macros must be issued in the new address space. The initialization routine, which runs in the new address space, is a good place to set up this environment. For help in writing this initialization routine, see Writing an Initialization Routine. Figure 1 shows how you synchronize the initialization process so that PC routines in the new address space are not called before the cross memory linkages are in place.