The SAS 9.4
ARM interface preserves the existing SAS 9.1 ARM interface as much as possible. The ARM
interface enables applications, tools, and facilities developed in SAS 9.1 ARM interface
and ARM 2.0 to execute without change using ARM 4.0. But, adding the new performance
(PERF) macros reduces performance overhead. The following sections document how to
add the SAS 9.4 ARM interface to existing SAS applications: