The caller of either the enable, disable or exchange request can use the INTOKEN parameter of the IEFSSVT macro to specify a token to identify the subsystem vector table that is to be modified. You can get the INTOKEN parameter by issuing the create request of the IEFSSVT macro. If you do not specify a token, the request applies to the active subsystem vector table (the subsystem vector table currently in use). In this case, the request fails if there is not an active subsystem vector table. You can specify the function routines in the subsystem vector table by name or by address.

Another way to change what your subsystem can do is to use the swap request of the IEFSSI macro. See Swapping Subsystem Functions for more information.